Muon Trigger Public Results

Introduction

Approved plots that can be shown by ATLAS speakers at conferences and similar events. Please do not add figures on your own. Contact the responsible project leader in case of questions and/or suggestions. Follow the guidelines on the trigger public results page.

CONF notes

CONF note on muon trigger performances in 2011 (7 TeV)

• Performance of the ATLAS Muon Trigger in 2011 ATLAS-CONF-2012-099

CONF note on muon trigger performances in 2010 (7 TeV)

• Performance of the ATLAS Muon Trigger in p-p collisions at √s = 7 TeV ATLAS-CONF-2010-095

CONF note on muon trigger performances in 2009 and 2010 (900 GeV and cosmic data)

• ATLAS Muon Trigger Performance in cosmic rays and pp collisions at √s = 900 GeV ATLAS-CONF-2010-013

Plots for Upgrade (higher luminosity/energy) studies

Level-1 muon trigger rate extrapolation to 14 TeV

Estimation of muon level-1 trigger rate extrapolated for sqrt(s)=14 TeV by emulating impact of new small wheel detector Estimation of ATLAS muon level-1 trigger rate extrapolated for pp collisions at √s=14 TeV with instantaneous luminosity of L=1034 cm-2s-1, shown as a function of pT threshold. The extrapolation uses measured rates at √s=7 TeV both at L=0.3•1034 cm-2s-1 and also with 25 ns bunch spacing in 2011 runs where the muon level-1 trigger rate was observed to be about 40% higher compared to 50 ns bunch spacing runs. To extrapolate from 7 TeV to 14 TeV, transfer factors were separately applied for non-fake and fake components (1.9±0.1 and 1.3±0.3 respectively) which are disentangled by means of presence of offline reconstructed muon track. The yellow band guides uncertainty due to the transfer factors. Also shown is an extrapolation with the new small wheel (NSW) planned for ATLAS Phase 1 upgrade. The impact of NSW requirements in trigger was emulated by using 2011 data, separately for non-fake and fake components. They are shown only for pT=20 GeV and higher thresholds.

eps

L2MuonSA Endcap pT Resolution Improvement

Fraction residuals of inverse pT Fractional residual of inverse-pT, (1/pT,FastMuonSA − 1/pT,offline)/(1/pT,offline), is shown where pT,FastMuonSA is the transverse momentum (pT) reconstructed by the fast muon stand-alone trigger algorithm (FastMuonSA) and pT,offline is the pT given by the offline reconstruction. Both the cases where the hits in the CSC chamber are used (blue) and not used (red) in the FastMuonSA are shown. The results were obtained by rerunning FastMuonSA on the 2016 data. The offline reconstructed muons that passed the muon trigger with the threshold of 4 GeV were considered in the results. Ranges of the offline muon pT are written in each plot. The CSC coverage in |ηRoI| is between 2.0 and 2.4, only muons reconstructed in this region by FastMuonSA are considered in this figure. In all pT,offline ranges, the 1/pT resolution is better when including hits from the CSCs.

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Inverse pT resolution Resolution of the inverse-pT by the fast muon stand-alone trigger algorithm (FastMuonSA) is shown as a function of the offline muon pT. The resolution is extracted by taking the σ of a Gaussian fit to the distribution of the fractional residual of inverse-pT, i.e. (1/pT,FastMuonSA − 1/pT,offline)/(1/pT,offline). The blue triangles show the resolution when FastMuonSA uses hits from CSC chambers, and the red circles show that when FastMuonSA does not use hits from CSC chambers. The results were obtained by rerunning FastMuonSA on the 2016 data. The offline reconstructed muons that passed the muon trigger with the threshold of 4 GeV were considered in the results. The CSC coverage in |ηRoI| is between 2.0 and 2.4, only muons reconstructed in this region by FastMuonSA are considered in this figure. The 1/pT resolution is improved when using the CSC hits in all pT,offline regions.

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Plots for 2022 data @ 13.6 TeV

Muon trigger performances in 2022 (approved plots for IEEE 2022) ATL-COM-DAQ-2022-108 (Nov 1, 2022)

Muon trigger efficiency as a function of offline muon pT in the barrel Muon trigger efficiency as a function of offline muon pT for Monte Carlo predictions and 0.6 fb-1 of data collected in October 2022 for the OR of the 24 GeV isolated trigger and the 50 GeV trigger. Only muons in the barrel (|η|< 1.05) region of the detector are considered. The Level 1 (L1) trigger requires a good muon candidate with a threshold that reaches 50% of the plateau efficiency at 14 GeV. At the High Level Trigger (HLT) level, the 24 GeV isolated trigger requires a muon candidate to satisfy a 24 GeV pT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, depending on the pT of the muon. The 50 GeV trigger requires that a muon candidate satisfies a pT threshold of 50 GeV. The efficiency is evaluated with the tag-and-probe method on Z → μμ events, in which offline muons are reconstructed with the standard ATLAS software passing the "Medium" quality requirement [1] . The background is found to be negligible and not taken into account in the estimation. Only statistical uncertainties are included in the plot. The bottom panel shows the ratio of the measured efficiency to the Monte Carlo prediction as a function of offline muon pTThe L1 trigger in the barrel region is simulated with an optimistic lower-bound on chamber efficiency to allow for a reasonable MC efficiency for chambers that are later recovered during data taking. [1] JINST 15 (2020) P09015	png pdf
Muon trigger efficiency as a function of offline muon pT in the endcap Muon trigger efficiency as a function of offline muon pT for Monte Carlo predictions and 0.6 fb-1 of data collected in October 2022 for the OR of the 24 GeV isolated trigger and the 50 GeV trigger. Only muons in the endcap (|η|> 1.05) region of the detector are considered. The Level 1 (L1) trigger requires a good muon candidate with a threshold that reaches 50% of the plateau efficiency at 14 GeV. At the High Level Trigger (HLT) level, the 24 GeV isolated trigger requires a muon candidate to satisfy a 24 GeV pT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, depending on the pT of the muon. The 50 GeV trigger requires that a muon candidate satisfies a pT threshold of 50 GeV. The efficiency is evaluated with the tag-and-probe method on Z → μμ events, in which offline muons are reconstructed with the standard ATLAS software passing the "Medium" quality requirement [1] . The background is found to be negligible and not taken into account in the estimation. Only statistical uncertainties are included in the plot. The bottom panel shows the ratio of the measured efficiency to the Monte Carlo prediction as a function of offline muon pT. [1] JINST 15 (2020) P09015	png pdf
Muon trigger efficiency as a function of offline muon φ in the barrel Muon trigger efficiency as a function of offline muon φ for Monte Carlo predictions and 0.6 fb-1 of data collected in October 2022 for the OR of the 24 GeV isolated trigger and 50 GeV trigger. Only muons in the barrel (|η|< 1.05) region of the detector are considered. The Level 1 (L1) trigger requires a good muon candidate with a threshold that reaches 50% of the plateau efficiency at 14 GeV. At the High Level Trigger (HLT) level, the 24 GeV isolated trigger requires a muon candidate to satisfy a 24 GeV pT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, depending on the pT of the muon. The 50 GeV trigger requires that a muon candidate satisfies a pT threshold of 50 GeV. The efficiency is evaluated with the tag-and-probe method on Z → μμ events, in which offline muons are reconstructed with the standard ATLAS software passing the "Medium" quality requirement [1] . The background is found to be negligible and not taken into account in the estimation. Only statistical uncertainties are included in the plot. The bottom panel shows the ratio of the measured efficiency to the Monte Carlo prediction as a function of offline muon φ. The efficiency measured in the barrel region is lower than the Run 2 efficiency due to detector operation related issues which have been partially recovered. The L1 trigger in the barrel region is simulated with an optimistic lower-bound on chamber efficiency to allow for a reasonable MC efficiency for chambers that are later recovered during data taking. [1] JINST 15 (2020) P09015	png pdf
Muon trigger efficiency as a function of offline muon φ in the endcap Muon trigger efficiency as a function of offline muon φ for Monte Carlo predictions and 0.6 fb-1 of data collected in October 2022 for the OR of the 24 GeV isolated trigger and the 50 GeV trigger. Only muons in the endcap (|η|> 1.05) region of the detector are considered. The Level 1 (L1) trigger requires a good muon candidate with a threshold that reaches 50% of the plateau efficiency at 14 GeV. At the High Level Trigger (HLT) level, the 24 GeV isolated trigger requires a muon candidate to satisfy a 24 GeV pT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, depending on the pT of the muon. The 50 GeV trigger requires that a muon candidate satisfies a pT threshold of 50 GeV. The efficiency is evaluated with the tag-and-probe method on Z → μμ events, in which offline muons are reconstructed with the standard ATLAS software passing the "Medium" quality requirement [1] . The background is found to be negligible and not taken into account in the estimation. Only statistical uncertainties are included in the plot. The bottom panel shows the ratio of the measured efficiency to the Monte Carlo prediction as a function of offline muon φ. [1] JINST 15 (2020) P09015	png pdf
Muon trigger efficiency as a function of offline muon η Muon trigger efficiency as a function of offline muon η for Monte Carlo predictions and 0.6 fb-1 of data collected in October 2022 for the OR of the 24 GeV isolated trigger and the 50 GeV trigger. The Level 1 (L1) trigger requires a good muon candidate with a threshold that reaches 50% of the plateau efficiency at 14 GeV. At the High Level Trigger (HLT) level, the 24 GeV isolated trigger requires a muon candidate to satisfy a 24 GeV pT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, depending on the pT of the muon. The 50 GeV trigger requires that a muon candidate satisfies a pT threshold of 50 GeV. The efficiency is evaluated with the tag-and-probe method on Z → μμ events, in which offline muons are reconstructed with the standard ATLAS software passing the "Medium" quality requirement [1] . The background is found to be negligible and not taken into account in the estimation. Only statistical uncertainties are included in the plot. The bottom panel shows the ratio of the measured efficiency to the Monte Carlo prediction as a function of offline muon η. The L1 trigger in the barrel (|η|< 1.05) region is simulated with an optimistic lower-bound on chamber efficiency to allow for a reasonable MC efficiency for chambers that are later recovered during data taking. [1] JINST 15 (2020) P09015	png pdf
Muon High Level Trigger efficiency as a function of truth muon φ Muon High Level Trigger (HLT) efficiency relative to the Level 1 (L1) efficiency as a function of truth muon φ for Z → μμ Monte Carlo predictions (MC) using the ATLAS software and simulation employed in Run3. The 26 GeV isolated trigger requires a muon candidate that satisfies the 26 GeV HLT pT threshold and passes a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, which depends on the pT of the muon. The HLT trigger efficiency is evaluated with respect to truth muons fulfilling the truth pT > 27 GeV and the corresponding L1 trigger requirement, that selects muons with a threshold that reaches 50% of the plateau efficiency at 14 GeV. Only statistical uncertainties are included in the plot.	png pdf
Muon High Level Trigger efficiency as a function of truth muon pT Muon High Level Trigger (HLT) efficiency relative to the Level 1 (L1) efficiency as a function of truth muon pT for Z → μμ Monte Carlo predictions (MC) using the ATLAS software and simulation employed in Run3. The 26 GeV isolated trigger requires a muon candidate that satisfies the 26 GeV HLT pT threshold and passes a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, which depends on the pT of the muon. The HLT trigger efficiency is evaluated with respect to truth muons fulfilling the corresponding L1 trigger requirement, that selects muons with a threshold that reaches 50% of the plateau efficiency at 14 GeV. Only statistical uncertainties are included in the plot.	png pdf
Muon High Level Trigger efficiency as a function of truth muon η Muon High Level Trigger (HLT) efficiency relative to the Level 1 (L1) efficiency as a function of truth muon η for Z → μμ Monte Carlo predictions (MC) using the ATLAS software and simulation employed in Run3. The 26 GeV isolated trigger requires a muon candidate that satisfies the 26 GeV HLT pT threshold and passes a medium isolation selection computed using inner detector tracks reconstructed online by the HLT with a variable cone size, which depends on the pT of the muon. The HLT trigger efficiency is evaluated with respect to truth muons fulfilling the truth pT > 27 GeV and the corresponding L1 trigger requirement, that selects muons with a threshold that reaches 50% of the plateau efficiency at 14 GeV. Only statistical uncertainties are included in the plot.	png pdf

Plots for 2018 data @ 13 TeV

Muon trigger performances in 2018 (approved plots for LHCC 2018) ATL-COM-DAQ-2018-047 (May 16, 2018)

Barrel muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level Triggers (HLT) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → μμ candidates, with no background subtraction applied, in 13 TeV data from 2018. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level Triggers (HLT) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2018. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level Triggers (HLT) plotted as a function of the number of reconstructed vertices in the event. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27 GeV and the barrel with |η|< 1.05. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2018. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level Triggers (HLT) plotted as a function of pT of offline muon candidates in the endcap detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → μμ candidates, with no background subtraction applied, in 13 TeV data from 2018. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level Triggers (HLT) plotted as a function of φ of offline muon candidates in the endcap detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2018. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level Triggers (HLT) plotted as a function of the number of reconstructed vertices in the event. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV and the endcap with 1.05 <|η|< 2.4. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2018. Only statistical data uncertainties are shown.	png pdf

Plots for 2017 data @ 13 TeV

Muon trigger performances in 2017 (approved plots for RBB 2017) ATL-COM-DAQ-2017-142 (Oct 19, 2017)

Barrel muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of the number of reconstructed vertices in the event. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV and the barrel with |η|< 1.05. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of pT of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of φ of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of the number of reconstructed vertices in the event. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV and the endcaps with 1.05 < |η| < 2.4. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Muon trigger efficiency as a function of muon η Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of η of offline muon candidates. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf

Muon trigger performances in early 2017 (approved plots for EPS 2017) ATL-COM-DAQ-2017-059 (Jul 3, 2017)

Barrel muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of the number of reconstructed vertices in the event. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV and the barrel with |η|< 1.05. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of pT of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of φ of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of the number of reconstructed vertices in the event. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV and the endcaps with 1.05 < |η| < 2.4. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf
Muon trigger efficiency as a function of muon η Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu60 High Level Triggers (HLT) plotted as a function of η of offline muon candidates. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region with pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and requires that a candidate satisfied a 26 GeV HLT threshold and passed a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu60 trigger is seeded by MU20 at L1 and requires that a candidate satisfied a pT threshold of 60 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2017. Only statistical data uncertainties are shown.	png pdf

Plots for 2016 data @ 13 TeV

Muon trigger performances in 2016 (approved plots for LHCC 2017) ATL-COM-DAQ-2017-005 (Feb 10, 2017)

Barrel muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region above pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of the number of reconstructed vertices in the event in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region above pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of pT of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of φ of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region above pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of the number of reconstructed vertices Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of the number of reconstructed vertices in the event in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region above pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Muon trigger efficiency as a function of muon η Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of the OR of mu26_ivarmedium with mu50 High Level triggers (HLT) plotted as a function of η of offline muon candidates. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The selection is restricted to the plateau region above pT > 27GeV. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu26_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 26 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The mu50 trigger is seeded by MU20 at L1 and is required to satisfy a pT threshold of 50 GeV. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf

Rate reduction by 2016 EI/FI-coincidence of Level-1 Endcap Muon Trigger

Pseudo-rapidity (η) distributions of the L1 muon trigger with and without EI/FI coincidence The pseudo-rapidity (η) distributions of the L1 muon trigger with the pT threshold of 20 GeV (L1_MU20) and the rate reduction effect by a coincidence with Small-Wheel TGCs which consist of Endcap Inner (EI) and Forward Inner (FI) chambers are shown, using events taken by a lower threshold L1 trigger (L1_MU11) in 2016. In this sample, the EI/FI coincidence decision made online was not applied however it is recorded as a flag. The region at |η|~1.5 where no rate reduction seen is because that the coincidence is not required due to the inactive region of FI chambers. Moreover, the coincidence around |η|~1.2 was intentionally not applied for the commissioning of the Tile-Muon coincidence [CERN-LHCC-2013-018].

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Level1 muon trigger performance in the EndCaps (2 vs 3 station coincidence)

L1_MU4 efficiency as a function of pT,μ (3 stations) L1_MU4 efficiency as a function of transverse momentum of offline muon (pT,μ) in the endcap region (|η|>1.05) where Thin Gap Chambers (TGC) are utilized, for Monte Carlo simulation (green) and data (red), as well as the ratio of those (blue). The efficiency is estimated by Tag-and-Probe method using J/ψ→μμ events. In this data period for L1_MU4 trigger, TGC hits coincidence was required among 3 stations except for some regions in the (R,η) plane.	pdf eps
L1_MU4 efficiency as a function of pT,μ (2 and 3 stations) L1_MU4 efficiency as a function of transverse momentum of offline muon (pT,μ) in the endcap region (|η|>1.05) where Thin Gap Chambers (TGC) are utilized. The efficiencies are shown for two different data sets taken with different TGC hits coincidence requirement: 2 stations coincidence (black) and 3 stations coincidence except for some regions in the (R,η) plane (red). The amount of data corresponds to 1.6 fb-1 for each. Also, the ratio (blue) between the two efficiencies is shown in the plot underneath.	pdf eps
Trigger cross section for 2 and 3 stations coincidence Trigger cross-section of L1_2MU4 (black), L1_MU6_2MU4 (blue), and L1_3MU4 (magenta) are shown as a function of the average number of interactions per LHC bunch crossing, where L1_2MU4 requires two L1 muons with pT ≥ 4 GeV, L1_MU6_2MU4 requires two L1 muons with pT ≥ 6,4 GeV, and L1_3MU4 requires three L1 muons with pT ≥ 4 GeV. The cross sections are shown for two different data sets taken with different TGC hits coincidence requirement: 2 stations coincidence (dashed lines) and 3 stations coincidence except for some regions in the (R,η) plane (markers).	pdf eps

Muon trigger performances in early 2016 (approved plots for LHCC)

L1 Barrel muon trigger efficiency as a function of muon pT in 2015 and 2016 Absolute efficiency of Level 1 (L1) MU20 trigger in 2015 (black) and in 2016 (red) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2015 and 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
L1 Barrel muon trigger efficiency as a function of muon φ in 2015 and 2016 Absolute efficiency of Level 1 (L1) MU20 trigger in 2015 (black) and in 2016 (red) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2015 and 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
L1 Endcap muon trigger efficiency as a function of muon pT in 2015 and 2016 Absolute efficiency of Level 1 (L1) MU20 trigger in 2015 (black) and in 2016 (red) plotted as a function of pT of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2015 and 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
L1 Endcap muon trigger efficiency as a function of muon φ in 2015 and 2016 Absolute efficiency of Level 1 (L1) MU20 trigger in 2015 (black) and in 2016 (red) plotted as a function of φ of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2015 and 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
L1 Muon trigger efficiency as a function of muon η in 2015 and 2016 Absolute efficiency of Level 1 (L1) MU20 trigger in 2015 (black) and in 2016 (red) plotted as a function of η of offline muon candidates. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2015 and 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of mu24_ivarmedium High Level trigger (HLT) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu24_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 24 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of mu24_ivarmedium High Level trigger (HLT) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu24_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 24 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of mu24_ivarmedium High Level trigger (HLT) plotted as a function of pT of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu24_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 24 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of mu24_ivarmedium High Level trigger (HLT) plotted as a function of φ of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu24_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 24 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Muon trigger efficiency as a function of muon η Absolute efficiency of Level 1 (L1) MU20 trigger and absolute and relative efficiencies of mu24_ivarmedium High Level trigger (HLT) plotted as a function of η of offline muon candidates. The efficiency is computed with respect to offline isolated muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU20 trigger requires that a candidate passed the 20 GeV threshold requirement of the L1 muon trigger system. The mu24_ivarmedium trigger is seeded by the MU20 trigger and is required to satisfy a 24 GeV HLT threshold and to pass a medium isolation selection computed using inner detector tracks reconstructed online by the HLT within a cone with a variable size which depends on the pT of the muon. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data from 2016 with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf

Plots for 2015 data @ 13 TeV

Muon trigger performances in 2015 25ns data-taking period

Barrel muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU15 trigger and absolute and relative efficiencies of the OR combination of mu20_iloose and mu50 High Level triggers (HLT) plotted as a function of pT of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20_iloose trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Barrel muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU15 trigger and absolute and relative efficiencies of the OR combination of mu20_iloose and mu50 High Level triggers (HLT) plotted as a function of φ of offline muon candidates in the barrel detector region. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20_iloose trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon pT Absolute efficiency of Level 1 (L1) MU15 trigger and absolute and relative efficiencies of the OR combination of mu20_iloose and mu50 High Level triggers (HLT) plotted as a function of pT of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20_iloose trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Endcap muon trigger efficiency as a function of muon φ Absolute efficiency of Level 1 (L1) MU15 trigger and absolute and relative efficiencies of the OR combination of mu20_iloose and mu50 High Level triggers (HLT) plotted as a function of φ of offline muon candidates in the endcap detector regions. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20_iloose trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf
Muon trigger efficiency as a function of muon η Absolute efficiency of Level 1 (L1) MU15 trigger and absolute and relative efficiencies of the OR combination of mu20_iloose and mu50 High Level triggers (HLT) plotted as a function of η of offline muon candidates. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20_iloose trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates, with no background subtraction applied, in 13 TeV data with 25 ns LHC bunch spacing. Only statistical data uncertainties are shown.	png pdf

Muon trigger performances in 2015 50ns data-taking period (approved plots for Lepton-Photon 2015)

Endcap muon trigger efficiency as a function of muon pT Efficiency of Level 1 (L1) MU15 trigger and mu20 iloose L1MU15 or mu50 High Level triggers (HLT) plotted as a function of pT of offline muon candidates in the endcap detector region. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20 iloose L1MU15 trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates in 13 TeV data with 50 ns LHC bunch spacing, with no background subtraction applied. The HLT efficiency is measured with respect to the offline candidates that pass the L1 trigger. Only statistical data uncertainties are shown.

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Endcap muon trigger efficiency as a function of muon phi Efficiency of Level 1 (L1) MU15 trigger and mu20 iloose L1MU15 or mu50 High Level triggers (HLT) plotted as a function of φ of offline muon candidates in the endcap detector region. The efficiency is computed with respect to offline muon candidates which are reconstructed using standard ATLAS software and are required to pass “Medium” quality requirement. The MU15 trigger requires that a candidate passed the 15 GeV threshold requirement of the L1 muon trigger system. The mu20 iloose L1MU15 trigger is seeded by the MU15 trigger and is required to satisfy a 20 GeV HLT threshold and to pass a loose isolation selection computed using inner detector tracks reconstructed online by the HLT. The mu50 trigger is seeded by the L1 MU20 trigger and is required to satisfy a 50 GeV HLT threshold. The efficiency is measured using a tag-and-probe method with Z → µµ candidates in 13 TeV data with 50 ns LHC bunch spacing, with no background subtraction applied. The HLT efficiency is measured with respect to the offline candidates that pass the L1 trigger. Only statistical data uncertainties are shown.

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Plots for 2012 data @ 8 TeV

Muon trigger performances in 2012 (approved plots for CHEP 2013)

Muon trigger rate at L1 This plot shows the trigger rate in kHz as a function of luminosity for several level-1 (L1) triggers taken during one LHC fill in 2012. This includes two high-pT single muon triggers (L1_MU15 and L1_MU20) as well as a three-muon trigger (L1_3MU4) and a two-muon trigger (L1_2MU10). L1 muon classifies candidates into six programmable pT thresholds: L1 MU4, L1 MU6, L1 MU10, L1 MU11, L1 MU15 and L1 MU20, where the number after L1 MU denotes the pT threshold in GeV for which the coincidence logic has been optimized. It can be seen that the trigger rate scales linearly as a function of luminosity.	eps pdf jpg
Muon trigger rate at EF This plot shows the trigger rate in Hz as a function of luminosity for several event-filter (EF) triggers taken during one LHC fill in 2012. EF_mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. EF_mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. EF_mu40_MSonly_barrel_tight is a single muon trigger based only on muon-spectrometer reconstruction. It is active only in the barrel region, and applies pT > 40 GeV. EF_2mu13 requires two or more muon candidates, each of which passes a single muon trigger with pT > 13 GeV. EF_mu18_mu8_FS requires at least one muon candidate which passes a single muon trigger with pT > 18 GeV, and subsequently employs the full scan algorithm to find two or more muon candidates with pT > 18 and 8 GeV for leading and sub-leading muons. EF_3mu6 requires at least three muon candidates each of which passes a single muon trigger with pT > 6 GeV.	eps pdf jpg
EF muon trigger rate component This plot shows the rate in Hz at the Event Filter (EF) for isolated single muon trigger at an instantaneous luminosity of 1034 cm‐2 s-1 as a function of the muon pT threshold at the EF. The ATLAS operating point used in 2012 is mu24i trigger which corresponds to the leftmost point in this figure. The other points were emulated by using the data recorded with mu24i trigger. Also, the expected rate contributions from W-boson production and Z-boson production using MC scaled with the predicted cross-section are shown. It can be seen that the contribution due to W and Z is approximately half of that observed in data at the mu24i operating point while with a threshold of pT > 40 GeV, the W and Z contribution begins to dominate.	eps pdf jpg
Efficiency of the primary single muon trigger -barrel region- Efficiency of the two single muon triggers, mu24i_tight and mu36_tight, convolved as an OR between the two. The mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. The mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. The efficiency is measured with respect to the offline reconstructed muons in the barrel region which is defined as the pseudo rapidity of the offline muon satisfies |η| < 1.05. It was measured by using Z-boson produced events with the tag-and-probe method. Both data and Monte Carlo simulation results are shown. Error bars include both statistical and systematic uncertainties. The net efficiency of the triggers, i.e. the efficiency passing all L1, L2 and EF selections, is shown. The plateau region is observed to have a very sharp turn-on around 25 GeV with an efficiency in the plateau of approximately 70%.	eps pdf jpg
Efficiency of the primary single muon trigger -endcap region- Efficiency of the two single muon triggers, mu24i_tight and mu36_tight, convolved as an OR between the two. The mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. The mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. The efficiency is measured with respect to the offline reconstructed muons in the endcap region which is defined as the pseudo rapidity of the offline muon satisfies |η| > 1.05. It was measured by using Z-boson produced events with the tag-and-probe method. Both data and Monte Carlo simulation results are shown. Error bars include both statistical and systematic uncertainties. The net efficiency of the triggers, i.e. the efficiency passing all L1, L2 and EF selections, is shown. The plateau region is observed to have a very sharp turn-on around 25 GeV with an efficiency in the plateau of approximately 86%.	eps pdf jpg
Efficiency of the primary single muon trigger separately for L1, L2, EF -barrel region, data- Efficiency of the two single muon triggers, mu24i_tight and mu36_tight, convolved as an OR between the two. The mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. The mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. The efficiency is measured with respect to the offline reconstructed muons in the barrel region which is defined as the pseudo rapidity of the offline muon satisfies |η| < 1.05. It was measured by using Z-boson produced events with the tag-and-probe method. Both data and Monte Carlo simulation results are shown. Error bars indicate statistical uncertainties only. The efficiencies are shown separately for L1 (written as “Level 1”), L1+L2 (written as “Level 2”) and L1+L2+EF (written as “Event Filter”) stages. The L1 threshold for these triggers is L1_MU15. It can be seen that the efficiency turn-on becomes sharper with each successive trigger level. The plateau efficiency is dominated by L1, where the HLT efficiency with respect to L1 is about 98%.	eps pdf jpg
Efficiency of the primary single muon trigger separately for L1, L2, EF -endcap region, data- Efficiency of the two single muon triggers, mu24i_tight and mu36_tight, convolved as an OR between the two. The mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. The mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. The efficiency is measured with respect to the offline reconstructed muons in the endcap region which is defined as the pseudo rapidity of the offline muon satisfies |η| > 1.05. It was measured by using Z-boson produced events with the tag-and-probe method. Both data and Monte Carlo simulation results are shown. Error bars indicate statistical uncertainties only. The efficiencies are shown separately for L1 (written as “Level 1”), L1+L2 (written as “Level 2”) and L1+L2+EF (written as “Event Filter”) stages. The L1 threshold for these triggers is L1_MU15. It can be seen that the efficiency turn-on becomes sharper with each successive trigger level. The plateau efficiency is dominated by L1, where the HLT efficiency with respect to L1 is about 98%.	eps pdf jpg
Efficiency of the middle-pT single muon triggers -barrel region, data- Efficiency of the single muon triggers, mu13, mu18_tight, mu24i_tight, mu36_tight and mu40_MSonly_barrel_tight. The mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. The mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. The efficiency is measured with respect to the offline reconstructed muons in the barrel region which is defined as the pseudo rapidity of the offline muon satisfies |η| < 1.05. It was measured by using Z-boson produced events with the tag-and-probe method. Error bars indicate statistical uncertainties only. The different plateau efficiency for EF_mu13 compared to the others come from EF_mu13 being seeded by L1_MU10 while the others are seeded from L1_MU15. The L1_MU10 trigger only requires hits in two RPC stations while L1_MU15 requires hits in all three RPC stations.	eps pdf jpg
Efficiency of the middle-pT single muon triggers -endcap region, data- Efficiency of the single muon triggers, mu13, mu18_tight, mu24i_tight, mu36_tight and mu40_MSonly_barrel_tight. The mu24i_tight is a single muon trigger requiring at least one isolated muon with pT > 24 GeV where isolation criterion is made with inner detector tracks. The mu36_tight is a single muon trigger requiring at least one muon with pT > 36 GeV without applying isolation cut. The efficiency is measured with respect to the offline reconstructed muons in the endcap region which is defined as the pseudo rapidity of the offline muon satisfies |η| > 1.05. It was measured by using Z-boson produced events with the tag-and-probe method. Error bars indicate statistical uncertainties only. Each trigger is observed to have a similar plateau efficiency.	eps pdf jpg

Muon trigger performances in 2012 (approved plots for ICHEP 2012)

Efficiency of single isolated muon trigger as a function of muon pT (barrel) Efficiency of the trigger EF_mu24i_tight with respect to offline reconstructed isolated muons as a function of pT for the barrel region. The efficiencies includes the geometric acceptance of the L1 trigger chambers. EF_mu24i_tight is a single muon trigger seeded by L1_MU15, which applies isolation requirements and a pT threshold of 24 GeV at the Event Filter. The tag-and-probe method with Z→μ+μ- events was used to derive efficiencies. Offline muons are required to satisfy the isolation requirement ΣpT/pT < 0.1. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 5.56 fb-1.	eps
Efficiency of single isolated muon trigger efficiency as a function of muon pT (endcap) Efficiency of the trigger EF_mu24i_tight with respect to offline reconstructed isolated muons as a function of pT for the endcap region. The efficiencies includes the geometric acceptance of the L1 trigger chambers. EF_mu24i_tight is a single muon trigger seeded by L1_MU15, which applies isolation requirements and a pT threshold of 24 GeV at the Event Filter. The tag-and-probe method with Z→μ+μ- events was used to derive efficiencies. Offline muons are required to satisfy the isolation requirement ΣpT/pT < 0.1. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 5.56 fb-1.	eps
Single isolated muon trigger efficiency as a function of number of interactions per bunch crossing (barrel) Efficiency of the trigger EF_mu24i_tight with respect to offline reconstructed isolated muons as a function of <μ>, average number of interactions per bunch crossing, for the barrel region. The efficiencies includes the geometric acceptance of the L1 trigger chambers. EF_mu24i_tight is a single muon trigger seeded by L1_MU15, which applies isolation requirements and a pT threshold of 24 GeV at the Event Filter. The tag-and-probe method with Z→μ+μ- events was used to derive efficiencies. Offline muons are required to satisfy the isolation requirement ΣpT/pT < 0.1. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 5.56 fb-1.	eps
Single isolated muon trigger efficiency as a function of number of interactions per bunch crossing (endcap) Efficiency of the trigger EF_mu24i_tight with respect to offline reconstructed isolated muons as a function of <μ>, average number of interactions per bunch crossing, for the endcap region. The efficiencies includes the geometric acceptance of the L1 trigger chambers. EF_mu24i_tight is a single muon trigger seeded by L1_MU15, which applies isolation requirements and a pT threshold of 24 GeV at the Event Filter. The tag-and-probe method with Z→μ+μ- events was used to derive efficiencies. Offline muons are required to satisfy the isolation requirement ΣpT/pT < 0.1. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 5.56 fb-1.	eps
HLT efficiency of single isolated muon trigger separately for the inside-out alone, outside-in alone, and the unified approaches (barrel) HLT trigger efficiency w.r.t. offline reconstructed isolated muons passing the L1 trigger in the barrel region. The blue distribution refers to the EF_mu24i_tight chain, which runs first the EF_mu24i_tight outside-in algorithm and, if it failed, the EF_mu24i_tight inside-out algorithm. During 2011 data taking only the one-algo-only algorithms were included in the trigger menu. EF_mu24i_tight is a single muon trigger seeded by L1_MU15, which applies isolation requirements and a pT threshold of 24 GeV at the Event Filter. The tag-and-probe method with Z→μ+μ- events was used to derive efficiencies. Offline muons are required to satisfy the isolation requirement ΣpT/pT < 0.1. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 0.74 fb-1.	eps
HLT efficiency of single isolated muon trigger separately for the inside-out alone, outside-in alone, and the unified approaches (endcap) HLT trigger efficiency w.r.t. offline reconstructed isolated muons passing the L1 trigger in the endcap region. The blue distribution refers to the EF_mu24i_tight chain, which runs first the EF_mu24i_tight outside-in algorithm and, if it failed, the EF_mu24i_tight inside-out algorithm. During 2011 data taking only the one-algo-only algorithms were included in the trigger menu. EF_mu24i_tight is a single muon trigger seeded by L1_MU15, which applies isolation requirements and a pT threshold of 24 GeV at the Event Filter. The tag-and-probe method with Z→μ+μ- events was used to derive efficiencies. Offline muons are required to satisfy the isolation requirement ΣpT/pT < 0.1. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 0.74 fb-1.	eps
Efficiency of trigger isolation requirement as a function of muon pT EF isolated muon trigger efficiency with respect to the offline isolated muons from Z decays as a function of pT. The track isolation variable (ΣpT) is defined as the sum of the pT of tracks having pT > 1 GeV found in the ID in a cone of ΔR = 0.2 around the muon candidate, after subtracting the pT of the muon. The circles show the relative efficiency with the relative track isolation cut at 0.12. The efficiency does not include the efficiencies of the previous steps of the isolated trigger chain. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 3.79 fb-1.	eps
Efficiency of trigger isolation requirement as a function of number of interactions per bunch crossing EF isolated muon trigger efficiency with respect to the offline isolated muons from Z decays as a function of <μ>, the average number of interactions per bunch crossing. The track isolation variable (ΣpT) is defined as the sum of the pT of tracks having pT > 1 GeV found in the ID in a cone of ΔR = 0.2 around the muon candidate, after subtracting the pT of the muon. The circles show the relative efficiency with the relative track isolation cut at 0.12. The efficiency does not include the efficiencies of the previous steps of the isolated trigger chain. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 3.79 fb-1.	eps
Trigger isolation variable as a function of number of interactions per bunch crossing Mean of the EF track isolation variable for muons from Z decays as a function of <μ>, the average number of interactions per bunch crossing. The vertical error bars in each figure represent the statistical errors. The amount of data used corresponds to 3.79 fb-1.	eps

L1 Muon trigger Rates in 2012

L1 muon rates as a function of the instantaneous luminosity, measured with 2012 data. The first row shows the rates obtained for pT >10 GeV muon selection (L1_MU10), the second row for pT >15 GeV selection (L1_MU15), the third row for pT >20 GeV (L1_MU20) selection. In the first column the total rates (Barrel+Endcaps |eta|<2.4) are displayed, while in the second (third) column the Barrel rates, |eta|<1.05 (the Endcaps rates, 1.05<|eta|<2.4) are displayed. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU10 muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU10 Barrel muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU10 Endcap muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU15 muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU15 Barrel muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU15 Endcap muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU20 muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU20 Barrel muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps
L1 MU20 Endcap muon rates as a function of the instantaneous luminosity, measured with 2012 data. The black points represent the total measured rate, the red points the fake rates. All uncertainties are statistical. A fake trigger is defined as a trigger that does not match with a offline reconstructed muon within a cone DR=√(η2+φ2) of 0.4. The higher fake fraction in the endcaps is due to the tracking outside the magnetic field, measuring only the deviation from the direction pointing towards the nominal IP position, and the smaller level arm with respect to the barrel layout. Fake triggers are understood to be mainly due to secondary particles, for example protons produced in dense materials such as the magnets. A linear fit is applied to both the total and fake rate curves, the fitted slopes are shown in the plots. The amount of data used corresponds to an integrated luminosity of about 1.8 fb-1.	eps

Plots for 2011 data @ 7 TeV

Muon trigger performances in 2011 (approved plots for CHEP 2012)

L1 trigger rates L1 trigger rates before prescale for a run recorded on 22 October 2011 with a fill of 1332 proton bunches in 12 trains with 50 ns bunch spacing. Open circles are for L1 MU10 (2-station and 3-station coincidence triggers in barrel and endcap regions, respectively), filled circles are for L1 MU11 (3-station coincidence trigger) and open squares are for L1 2MU4.	eps
L1 efficiency (barrel) L1 trigger efficiency with respect to isolated offline combined muons in the barrel region as a function of pT of the muon. Filled circles and open circles show L1 MU10 (2-station coincidence trigger) and L1 MU11 (3-station coincidence trigger) efficiencies, respectively. The tag-and-probe method with Z was used to derive efficiencies. The efficiencies include geometrical acceptance of the RPC detector. The vertical error bars show the statistical errors. The amount of data used for the efficiency measurement corresponds to 0.35 pb-1, taken after the last calibration performed on RPC detector during 2011 data taking period.	eps
L1 efficiency (endcapl) L1 trigger efficiency with respect to isolated offline combined muons in the endcap regions as a function of pT of the muon. Open circles show L1 MU11 (3-station coincidence trigger) efficiency. The tag-and-probe method with Z was used to derive efficiencies. The efficiencies include geometrical acceptance of the TGC detectors. The vertical error bars show the statistical errors. The amount of data used for the measurement corresponds to 2.8 fb-1.	eps
L2 muon trigger execution time Measured execution times per RoI of the L2 combined reconstruction chain. The processing times of HLT algorithms have been determined on Intel Core Duo CPU E8400 with clock speed of 3.00 GHz running on raw data from the events selected by jet, tau or missing ET triggers at a luminosity of about 3.1 x 1033 cm-2s-1. In 2011 the computing nodes of the HLT consisted mainly of Intel Harpertown quad-core CPUs running at 2.5 GHz. The mean time of the algorithm is indicated in the legend.	eps
EF muon trigger execution time Measured execution times per RoI of EF reconstruction chains. One chain starts from muon spectrometer track (outside-in) and another chain starts from inner detector track (inside-out). The processing times of HLT algorithms have been determined on Intel Core Duo CPU E8400 with clock speed of 3.00 GHz running on raw data from the events selected by jet, tau or missing ET triggers at a luminosity of about 3.1 x 1033 cm-2s-1. Solid and dashed lines are for outside-in and inside-out chains, respectively. In 2011 the computing nodes of the HLT consisted mainly of Intel Harpertown quad-core CPUs running at 2.5 GHz. The mean time of each algorithm is indicated in the legend. In 2012, outside-in algorithm is complemented by inside-out algorithm.	eps
EF trigger rate Trigger rates for a run recorded on 22 October 2011 with a fill of 1332 proton bunches in 12 trains with 50 ns bunch spacing. Rates of two independent EF trigger algorithms, one starting from muon spectrometer track (outside-in) and another starting from inner detector track (inside-out), are shown. Filled circles and open circles are for mu18 medium inside-out and mu18 medium outside-in algorithms, respectively. The mu18 medium is the unprescaled triggers seeded by L1 MU11 (3-station coincidence trigger). The lower part of the plot shows ratio of rate to luminosity. The vertical error bars show the statistical errors.	eps
muon trigger efficiency as a function of offline muon pT (barrel) Efficiencies in terms of offline muon pT for mu18 medium trigger, which uses muon spectrometer track based algorithm at EF (outside-in), in the barrel region. The mu18 medium is the unprescaled triggers seeded by L1 MU11 (3-station coincidence trigger). The tag-and-probe method with Z was used to derive efficiencies. In upper part of the plot, open circles and filled boxes show data and MC, respectively. Lower part of the plot shows ratio of data efficiencies to those of Monte Carlo. The vertical error bars and the vertical size of the boxes show the statistical errors. The amount of data used for the trigger efficiency measurement corresponds to 2.8 fb-1.	eps
muon trigger efficiency as a function of offline muon pT (endcap) Efficiencies in terms of offline muon pT for mu18 medium trigger, which uses muon spectrometer track based algorithm at EF (outside-in), in the endcap regions. The mu18 medium is the unprescaled trigger seeded by L1 MU11 (3-station coincidence trigger). The tag-and-probe method with Z was used to derive efficiencies. In upper part of the plot, open circles and filled boxes show data and MC, respectively. Lower part of the plot shows ratio of data efficiencies to those of Monte Carlo. The vertical error bars and the vertical size of the boxes show the statistical errors. The amount of data used for the trigger efficiency measurement corresponds to 2.8 fb-1.	eps
muon trigger efficiency as a function of interactions per bunch crossing Trigger efficiencies in plateau region (pT > 20 GeV) as a function of interactions per bunch crossing with data collected during LHC operation at β∗ = 1.0 m. The tag-and-probe method with Z was used to derive efficiencies. The figure is for mu18 medium trigger with muon spectrometer track based algorithm at EF (outside-in). The mu18 medium is the unprescaled triggers seeded by L1 MU11 (3-station coincidence trigger). Circles and triangles are for barrel and endcap regions, respectively. The difference of efficiencies in barrel and endcap regions are due to geometrical acceptance of level1 trigger chambers. The vertical error bars show the statistical errors. The amount of data used corresponds to 1.9 fb-1.	eps
L2 calorimeter and track isolation variables as a function of number of vertexes Mean of L2 isolation variables calculated for muons from Z decays in terms of number of reconstructed vertices. Triangles show the mean transverse energy deposition in annuli, defined as 0.07 < ∆R < 0.2 in electromagnetic calorimeter and 0.1 < ∆R < 0.2 in hadronic calorimeter, around the muon candidate. Circles show the mean of the sum of track pT around the muon candidate. Inner detector tracks in a cone size of ∆R = 0.2 around the muon candidate with pT > 1 GeV satisfying |z0(inner detector track) − z0(muon track)| < 15 mm are used for the sum. The pT of the muon candidate is subtracted from the sum. The vertical error bars show the statistical errors. The amount of data used corresponds to 220 pb-1.	eps
Efficiency and rejection of L2 calorimeter isolation Efficiency and rejection of the L2 isolated trigger with 18 GeV threshold as a function of the cut on the ΣET /pT (μ). Annuli, defined as 0.07 < ∆R < 0.2 in electromagnetic calorimeter and 0.1 < ∆R < 0.2 in hadronic calorimeter, around the muon candidate are used for the ΣET calculation. The efficiency is estimated with respect to isolated muons from Z → μμ decays and the rejection (defined as 1 - efficiency) is derived with respect to L2 combined muon candidates with 18 GeV threshold. The amount of data used corresponds to 180 pb-1.	eps
Efficiency and rejection of L2 track isolation Efficiency and rejection of the L2 isolated trigger with 18 GeV threshold as a function of the cut on the ΣpT /pT (μ). The cone size of 0.2 around the muon candidate is used for ΣpT calculation. Only the L2 inner detector tracks with pT > 1 GeV satisfying |z0 (L2 track) − z0 (L2 SA)| < 15 mm are used for the sum. The pT of the muon candidate is subtracted from the sum. The efficiency is estimated with respect to isolated muons from Z → μμ decays and the rejection (defined as 1 - efficiency) is derived with respect to L2 combined muon candidates with 18 GeV threshold. Majority of muons from Z decays have ΣpT /pT (μ) close to 0 thus the efficiency curve starts from 0.95. The amount of data used corresponds to 180 pb-1.	eps
Efficiency and rejection of L2 isolation working points Rejection for L2 muon candidates selected by 18 GeV threshold trigger in terms of efficiency for muons from Z decays with optimised isolation criteria. Dots on the curve show operating points for tight isolation (Σ ET < 1.4 GeV and Σ pT < 5.7 GeV) and loose isolation (Σ ET < 2.7 GeV) triggers. The amount of data used corresponds to 180 pb-1.	eps
Distribution of EF track isolation variable Distributions of the ratio between the sum of the pT of tracks around the muon candidate to the pT of the muon candidate. Only the EF inner detector tracks in a cone size of ∆R = 0.2 around the muon candidate with pT > 1 GeV satisfying |z0(inner detector track) − z0(muon track)| < 10 mm are used for the above sum. The pT of the muon candidate is subtracted from the sum. Histogram hatched with left slanted lines shows distributions for isolated muons coming from Z decays. Histogram hatched with right slanted lines are for muon candidates identified by EF combined trigger with 22 GeV threshold. The amount of data used corresponds to 220 pb-1.	eps
Efficiency of EF track isolation EF isolated muon trigger efficiency with respect to offline isolated muon from Z decays as a function of the pT of the muon. The ratio between the sum of the pT of tracks around the muon candidate to the pT of the muon candidate is required to be less than 0.12. The cut is used in 2012 data taking period. Only the EF inner detector tracks in a cone size of ∆R = 0.2 around the muon candidate with pT > 1 GeV satisfying |z0(inner detector track) − z0(muon track)| < 10 mm are used for the above sum. The pT of the muon candidate is subtracted from the sum. The amount of data used corresponds to 220 pb-1.	eps
EF track isolation variable as a function of number of vertexes Mean of track isolation variable calculated at EF for muons coming from Z decays in terms of number of reconstructed vertices. Muons are selected by EF combined trigger with 22 GeV threshold. Circles show the mean of the sum of track pT around the muon candidate. Inner detector tracks in a cone size of ∆R = 0.2 around the muon candidate with pT > 1 GeV satisfying |z0(inner detector track) − z0(muon track)| < 10 mm are used for the sum. The pT of the muon candidate is subtracted from the sum. The vertical error bars show the statistical errors. The amount of data used corresponds to 220 pb-1.	eps
Rejection and efficiency of EF track isolation working point Rejection for EF muon candidates selected by 22 GeV threshold trigger in terms of efficiency for muons from Z decays. The ratio between the sum of the pT of tracks around the muon candidate to the pT of the muon candidate is varied to make the curve. Inner detector tracks in a cone size of ∆R = 0.2 around the muon candidate with pT > 1 GeV satisfying |z0(inner detector track) − z0(muon track)| < 10 mm are used for the sum. The pT of the muon candidate is subtracted from the sum. The operating point of the isolated trigger in 2012 is shown with the filled circle. The amount of data used corresponds to 220 pb-1.	eps

Trigger efficiencies as a function of interactions per bunch crossing for LHCC

EF mu18 Trigger Efficiency with respect to combined muon reconstruction (barrel region) The measured efficiency of the single muon trigger for pT > 18 GeV muons (“mu18”) at η < 1.05, as a function of interactions per bunch crossing. The efficiencies were measured separately for two trigger chains one is seeded fromLevel-1 2-station trigger, the other is seeded from Level-1 3-station trigger. The 2-station trigger was in use for limited run periods of 2011 data taking, thus this measurement is llimited up to interactions per bunch crossing around 13. The efficiency was measured with respect to muons reconstructed offline with pT > 20 GeV, with the Tag-and-Probe method by using muons from Z decays.

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EF mu18 Trigger Efficiency with respect to combined muon reconstruction (endcap region) The measured efficiency of the single muon trigger for pT > 18 GeV muons (“mu18”) at η > 1.05, as a function of interactions per bunch crossing. The efficiency was measured with respect to muons reconstructed offlinewith pT > 20 GeV, with the Tag-and-Probe method by using muons from Z decays.

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L1 Barrel (RPC) Trigger efficiencies for LHCC

L1 Barrel Trigger Efficiency with respect to combined muon reconstruction (as a function of pT) L1 muon barrel trigger efficiency, for the six nominal thresholds, with respect to offline reconstructed muon as a function of the muon pT. The different acceptance between the 2-station coincidence low-pT thresholds (MU4, MU6, MU10) and the 3-station coincidence high-pT thresholds (MU11, MU15, MU20) is caused by the smaller coverage for the additional coincidence. The efficiency has been determined with a tag and probe method using di-muon events. The data used correspond to total integrated luminosity of 380 pb-1.	pdf
L1 Barrel Trigger Efficiency with respect to combined muon reconstruction (as a function of η) The L1 muon barrel trigger efficiency, for the 2-station threshold MU10 and the 3-station threshold MU11, with respect to offline reconstructed combined muon, selected with pT > 15 GeV, as a funciton of the muon η. The efficiency has been determined with a tag and probe method using di-muon events. The data used correspond to total integrated luminosity of 380 pb-1.	pdf
L1 Barrel Trigger Efficiency with respect to combined muon reconstruction (as a function of φ) The L1 muon barrel trigger efficiency, for the 2-station threshold MU10 and the 3-station threshold MU11, with respect to offline reconstructed combined muon, selected with pT > 15 GeV, as a funciton of the muon φ. The efficiency has been determined with a tag and probe method using di-muon events. The data used correspond to total integrated luminosity of 380 pb-1.	pdf
L1 Barrel Trigger Efficiency for different periods with number of interactions per bunch crossing, with respect to combined muon reconstruction (as a function of pT) The L1 muon barrel trigger efficiency, for the 2-station threshold MU10, with respect to offline reconstructed combined muon as a funciton of the muon pT. The efficiency curves are shown for different ranges of the average value of the number of interactions per bunch crossing, μ. The efficiency has been determined with a tag and probe method using di-muon events. The data used correspond to total integrated luminosity of 380 pb-1.	pdf
L1 Barrel Trigger Efficiency for different periods with number of interactions per bunch crossing, with respect to combined muon reconstruction (as a function of pT) The L1 muon barrel trigger efficiency, for the 3-station threshold MU11, with respect to offline reconstructed combined muon as a funciton of the muon pT. The efficiency curves are shown for different ranges of the average value of the number of interactions per bunch crossing, μ. The efficiency has been determined with a tag and probe method using di-muon events. The data used correspond to total integrated luminosity of 380 pb-1.	pdf

MuFast plot for IEEE 2011

Beta distribution in endcap regions for muon track of pT=20 GeV Beta distribution in endcap regions for muon track of pT=20 GeV where the magnetic field is homogeneous. Beta measures the track bending: it is the angle among the muon track segment fit in the innermost chamber (i.e. before the bending of the endcap toroid) and the muon track segment fit in the middle / middle+outermost chambers (i.e. after the bending of the endcap toroid).	pdf
Beta distribution in endcap transition regions for muon track of pT=20 GeV Beta distribution for muon track of pT=20 GeV in the endcap regions where the magnetic field is highly inhomogeneous. Beta measures the track bending: it is the angle among the muon track segment fit in the innermost chamber (i.e. before the bending of the endcap toroid) and the muon track segment fit in the middle / middle+outermost chambers (i.e. after the bending of the endcap toroid).	pdf
MuFast online execution time Plot showing the MuFast online wall-clock time (i.e. including the ROS access/data transfer time) per RoI. The wall-clock time of the mu13 selection chain, including the Inner Detector tracking and the combined reconstruction algorithm is also shown.	pdf
MuFast pT resolution after tuning (barrel) Relative pT resolution for the barrel region (|eta|<1.05) for 2010 data reprocessed with the Look Up Tables (LUT) for the pT estimation computed using the best knowledge of the alignment condition data.	pdf
MuFast pT resolution after tuning (endcap) Relative pT resolution for the endcap region (1.05<|eta|<2.4) for 2010 data reprocessed with tuned Look Up Tables (LUT) computed using the best knowledge of the alignment condition data.	pdf
MuFast pT resolution on 2011 data Relative pT resolution of MuFast for 2011 data as a function of the reconstructed muon pT. At high-pT, the barrel performance are slightly degraded with respect to the tuning. It is likely due to change in alignment constant: the effect correspond to a spread of 2-3 mm in the track sagitta.	pdf
MuFast efficiency in the barrel region for 2011 data Turn on curves for the barrel region computed with respect to LVL1. The total 2% plateau inefficiency of MuFast originates from border effect in the feet region of the spectrometer (~0.7%) and from bad detector status and/or bad LVL1 timing.	pdf
MuFast efficiency in the endcap region for 2011 data Turn on curves for the endcap region computed with respect to LVL1. The total 4% inefficiency of MuFast originates mostly from the large resolution tails in the transition region (1.3<|eta|<1.5) where the magnetic is highly inhomogenous due to the interference among the barrel and the endcap toroids. The inefficiency due to bad detector status and/or bad LVL1 timing is about 1%.	pdf

Trigger efficiencies for PLHC2011

EF mu18 Trigger Efficiency with respect to combined muon reconstruction Efficiency of the muon trigger with 18 GeV nominal threshold vs muon $\eta$, with respect to offline combined muon reconstruction, evaluated with a Tag And Probe method on Zmumu events. Data corresponding to an integrated luminosity of 138.5 pb-1, taken in the first months of 2011 (dots), are compared to the Zmumu MC signal sample (triangles). The overall data efficiency is 0.8125 $\pm$ 0.0015 while the MC efficiency is 0.7902 $\pm$ 0.0002, statistical errors only. In the bottom part the SF(DATA/MC) is reported which is 1.0283 $\pm$ 0.0016 overall. The data/MC scale factor is about 2\%, i.e. data efficiency is highier then MC. This reflects the improvements in the detector operation point tuning not yet propagated to the simulation.

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EF mu18 Trigger Efficiency with respect to combined muon reconstruction Efficiency of the muon trigger with 18 GeV nominal threshold vs muon pT, with respect to offline combined muon reconstruction, evaluated with a Tag And Probe method on Zmumu events. Data corresponding to an integrated luminosity of 138.5 pb-1, taken in the first months of 2011 (dots), are compared to the Zmumu MC signal sample (triangles). The overall data efficiency is 0.8125 $\pm$ 0.0015 while the MC efficiency is 0.7902 $\pm$ 0.0002, statistical errors only. In the bottom part the SF(DATA/MC) is reported which is 1.0283 $\pm$ 0.0016 overall. The data/MC scale factor is about 2\%, i.e. data efficiency is highier then MC. This reflects the improvements in the detector operation point tuning not yet propagated to the simulation.

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Plots for 2010 data @ 7 TeV

Trigger efficiencies

L1 Muon trigger efficiencies

L1 Muon Endcap Trigger Efficiency wrt to offline L1 Muon Endcap Trigger Efficiency as a function of pT from offline reconstructed spectrometer only muons extrapolated to the interaction region (Muon "Stand Alone" pT). The efficiency is calculated with respect to offline muons reconstructed with the muon spectrometer and the inner detector with η >1.05. L1 RoI to offline matching criteria is DR<0.5.	pdf
L1 Muon Endcap Trigger (6GeV) Efficiency wrt to offline The plot shows the L1 muon trigger efficiency relative to the offline muons in the end-cap regions for the 2nd lowest threshold, L1_MU6. To derive this L1_MU6 efficiency, the same method as described in ATL-COM-GEN-2010-023 is used; the used sample is based on L1 calorimeter jet trigger (L1_J30) and amounts approximately 213 nb-1 of effective luminosity. The offline combined muon was required to have 1.05 < | eta | < 2.40. A matching criteria between L1 muon candidate and offline reconstructed muon of dR<0.5 was applied. The efficiency is measured with respect to offline reconstructed combined muons as a function of the spectrometer muon pT (turn-on curve). The turn-on curve is fitted with the Fermi function The plateau efficiency (A) is determined as 0.936±0.006.	jpg pdf
L1 Muon Barrel Trigger Efficiency wrt to offline L1 Muon Barrel Trigger Efficiency as a function of pT from offline reconstructed spectrometer only muons extrapolated to the interaction region (Muon "Stand Alone" pT). The efficiency is calculated with respect to offline muons reconstructed with the muon spectrometer and the inner detector with | eta | <1.05. L1 RoI to offline matching criteria is DR<0.5. Overlaid are fully simulated minimum bias and single muon Monte Carlos.	pdf
L1 Muon Barrel Trigger (6GeV) Efficiency wrt to offline L1 Barrel Muon Trigger Efficiency as a function of pT from offline reconstructed spectrometer only muons extrapolated to the interaction region (Muon "Stand Alone" pT). The nominal trigger threshold is set to pt>6 GeV. The efficiency is calculated with respect to offline muons reconstructed with the muon spectrometer and the inner detector with | eta | <1.05. L1 RoI to offline matching criteria is DR<0.5. Overlaid are fully simulated minimum bias and single muon Monte Carlos.	pdf
L1 Trigger efficiency measured with J/Psi and "tag and probe" method Trigger efficiency of L1 muon for the lowest threshold MU0 as a function of the offline muon pT obtained with a tag and probe method on Jpsi candidates using combined muons for both the tag and probe tracks. Events are required to have passed the L1 MinBias trigger and a muon EventFilter confirmation. A reconstructed primary vertex with at least 3 Inner Detector (ID) track is required in each event. Muon combined tracks in the eta range [-2.4,2.4] are required to match with a reconstructed primary vertex with z<10mm. Only muons associated with ID tracks that have at least one hit in the pixels and six in the SCT are accepted. The Jpsi candidates have been selected asking for two opposite sign muons and with angular distance 0.4<DR<2.0 and with an invariant mass window between 2860 MeV and 3340 MeV. The tag and probe method has been applied matching the combined muons to muon trigger RoIs using the geometrical criteria DR<0.4. L1 triggers found within +- 3 BCs are included in the efficiency calculation as the RPC L1 timing is not yet fully commissioned.The used data sample corresponds to an integrated luminosity of about 210nb-1.	gif eps

HLT muon trigger efficiencies performance

L2 muon efficiency (spectrometer only) Efficiency of the L2 muon spectrometer only trigger wrt to the L1 muon trigger as a function of the transverse momentum pT from offline reconstructed spectrometer only muons extrapolated to the interaction region. A cut at L2 is applied to retain muons with pt>4GeV.	pdf
L2 muon trigger efficiency (spectrometer and inner detector) Efficiency of the L2 muon trigger combining muon spectrometer and inner detector information wrt to the L1 muon trigger as a function of the transverse momentum pT from offline reconstructed combined muons. A cut at L2 is applied to retain muons with pt>4GeV.	pdf
EF muon efficiency (spectrometer and inner detector) Efficiency of the Event Filter muon trigger, combining muon spectrometer and inner detector information (CB), wrt to L2 CB muon trigger as a function of the transverse momentum pt from offline reconstructed CB muons. A cut at EF is applied to retain muons with pt>4GeV.	pdf
EF muon combined efficiency Efficiency of the Event Filter muon combined trigger wrt to L2 muon combined trigger as a function of the rapidity eta from offline reconstructed combined muons. A cut at EF is applied to retain muons with pt>4GeV.	pdf

RPC and TGC trigger efficiencies

L1 RPC trigger Efficiency wrt offline muons Trigger Efficiency of L1 RPC for the lowest threshold MU0 relative to offline combined muons, as a function of pT (offline). Data sample selected from runs 152777-153599, require >=3 Inner Detector tracks and L1 Minimum Bias trigger. Efficiency calculated with respect to offline combined Muons with η <1.05. L1 RoI to offline matching criteria is DR<0.5. Error is defined as smallest interval containing 68% of posterior with flat prior using Bayesian statistics.Remarks: Inefficiency at plateau is mainly due to the detector geometrical acceptance. L1 triggers found within +-3BCs are included in the efficiency calculation as the RPC L1 timing is not yet fully commissioned. A plateau value of 84% is expected when the RPC detector is fully commissioned.

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L1 TGC trigger Efficiency wrt offline muons L1 TGC trigger efficiency for the lowest threshold MU0 relative to offline combined muons, as a function of pT(offline) for η >1.05. Require a match of L1 ROI to offline muon, matching criteria is DR<0.5. Data sample selected from runs 152166-153200, require >=3 Inner Detector tracks, and a L1 Minimum Bias trigger.

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HLT trigger efficiencies and L2 track parameters for long run 153565 in April

L2 muon standalone, algorithm efficiency wrt offline muons, L1 muon trigger required Efficiency of the L2 muon standalone algorithm relative to offline reconstructed muons as a function of the transverse momentum pT measured by the offline. Data selected is run 153565, require a L1 muon trigger, offline selection requires a reconstructed combined muon with a pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5, and a match with a L1 RoI in DR<0.5. Error is defined as smallest interval containing 68% of posterior with flat prior using Bayesian statistics.	pdf
L2 muon standalone, efficiency with a nominal threshold set to 4 GeV wrt offline muons, L1 muon trigger required Efficiency of L2 muon standalone algorithm relative to offline reconstructed muons with a nominal threshold set to 4 GeV as a function of the transverse momentum pT measured by the offline reconstruction (turn-on curve). Data selected is run 153565, require a L1 muon trigger, offline selection requires a reconstructed combined muon with a pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5, and a match with a L1 RoI in DR<0.5. Error is defined as smallest interval containing 68% of posterior with flat prior using Bayesian statistics.	pdf
L2 muon standalone, track parameter comparison to offline Transverse momentum pT determined by the L2 muon standalone algorithm versus pT measured offline. Data selected is run 153565, offline selection requires a L1 muon trigger, a reconstructed combined muon with a pT>6 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5, and a match with a L1 RoI in DR<0.5.	pdf
L2 muon combined, efficiency with a nominal threshold set to 4 GeV wrt offline and L2 standalone muons, for the Barrel region (* η <1.05) Efficiency of the L2 muon combined algorithm relative to the L2 muon spectrometer algorithm with a nominal threshold set to 4 GeV as a function of the transverse momentum pT of the offline reconstructed combined muon. Data selected is run 153565, require a L1 muon trigger, offline selection requires a reconstructed combined muon with rapidity eta <1.05 (Barrel region), pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5, and a match with a L1 RoI in DR<0.5. Error is defined as smallest interval containing 68% of posterior with flat prior using Bayesian statistics.	pdf
L2 muon combined, efficiency with a nominal threshold set to 4 GeV wrt offline and L2 standalone muons, for the Endcap region (* η >1.05) Efficiency of the L2 muon combined algorithm relative to the L2 muon spectrometer algorithm with a nominal threshold set to 4 GeV as a function of the transverse momentum pT of the offline reconstructed combined muon. Data selected is run 153565, require a L1 muon trigger, offline selection requires a reconstructed combined muon with rapidity eta >1.05 (endcap region), pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5, and a match with a L1 RoI in DR<0.5. Error is defined as smallest interval containing 68% of posterior with flat prior using Bayesian statistics.Remark: The lower efficiency observed is due to a not yet optimised search window for the inner detector tracks around the muon direction in the endcap transition region where the resolutions in the muon spectrometer is inferior due to the configuration of magnetic field.	pdf
L2 muon combined, track parameters wrt to offline Comparison of the transverse momentum pT as measured by the L2 muon combined algorithm and offline combined muon reconstruction. Data selected is run 153565, offline selection requires a L1 muon trigger, a reconstructed combined muon with pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5, and a match with a L1 RoI in DR<0.5.	pdf

EF muon standalone, algorithm efficiency wrt to offline muons Efficiency of the EF muon standalone algorithm relative to offline reconstructed combined muon, as a function of transverse momentum pT as measured by the offline. Data selected is run 153565, offline selection requires a reconstructed combined muon with pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5. Error is defined as smallest interval containing 68% of posterior with flat prior using Bayesian statistics.	pdf
EF muon standalone, comparison of track parameters to offline Comparison of the transverse momentum pT measured by the EF muon standalone algorithm and the offline standalone pT measurement of the offline combined muon. Data selected is run 153565, offline selection requires a reconstructed combined muon with pT>2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5.	pdf
EF muon combined, comparison of track parameters to offline Comparison of the transverse momentum pT measured by the EF muon combined algorithm and the offline combined muon reconstruction. Data selected is run 153565, offline selection requires a reconstructed combined muon with pT >2 GeV, momentum p>4 GeV, number of hits in the silicon detectors >5.	pdf

Di-muons Trigger Efficiency

EF_mu4_jpsimumu efficiency respect to the higher pT combined muon Efficiency of the di-muons trigger EF_mu4_Jpsimumu vs muon p T (the higher pT muon) evaluated on candidate J/ψ →µµ events with respect to offline combined muon reconstruction. Data corresponding to an integrated luminosity of 38 pb－1 taken in the 2010 (dots), are compared to the J/ψ →µµ MC signal sample (triangles). The data efficiency evaluated at plateau (for muon pT>8 GeV) is 0.787 ± 0.005 while the MC efficiency is 0.786 ±0.003, statistical errors only.	pdf
EF_mu4_jpsimumu efficiency respect to the lower pT combined muon Efficiency of the di-muons trigger EF_mu4_Jpsimumu vs muon p T (the lower pT muon) evaluated on candidate J/ψ →µµ events with respect to offline combined muon reconstruction. Data corresponding to an integrated luminosity of 38 pb－1 taken in the 2010 (dots), are compared to the J/ψ →µµ MC signal sample (triangles).	pdf
EF_mu4_jpsimumu efficiency respect to the eta of the higher pT combined muon Efficiency of the di-muons trigger EF_mu4_Jpsimumu vs muon η (the higher pT muon) evaluated on candidate J/ψ →µµ events with respect to offline combined muon reconstruction. Data corresponding to an integrated luminosity of 38 pb－1 taken in the 2010 (dots), are compared to the J/ψ →µµ MC signal sample (triangles).	pdf
EF_mu4_jpsimumu efficiency respect to the eta of the lower pT combined muon Efficiency of the di-muons trigger EF_mu4_Jpsimumu vs muon η (the lower pT muon) evaluated on candidate J/ψ →µµ events with respect to offline combined muon reconstruction. Data corresponding to an integrated luminosity of 38 pb－1 taken in the 2010 (dots), are compared to the J/ψ →µµ MC signal sample (triangles).	pdf
EF_mu4_jpsimumu efficiency respect vs ΔR between the two muons Efficiency of the di-muons trigger EF_mu4_Jpsimumu vs ΔR between the two muons evaluated on candidate J/ψ →µµ events with respect to offline combined muon reconstruction. Data corresponding to an integrated luminosity of 38 pb－1 taken in the 2010 (dots), are compared to the J/ψ →µµ MC signal sample (triangles).	pdf
EF_2mu4_jpsimumu efficiency respect to the higher pT combined muon Efficiency of the di-muons trigger EF_2mu4_Jpsimumu vs muon p T (the higher pT muon) evaluated on candidate J/ψ →µµ events with respect to offline combined muon reconstruction. Data corresponding to an integrated luminosity of 38 pb－1 taken in the 2010 (dots), are compared to the J/ψ →µµ MC signal sample (triangles). The data efficiency evaluated at plateau (for muon pT>8 GeV) is 0.41 ± 0.05 while the MC efficiency is 0.39 ± 0.04, statistical errors only.	pdf