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B Physics Trigger Public Results

Introduction

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Data 2022 @ 13.6 TeV

B-Physics trigger performance plots from 13.6 TeV data collected in 2022

Invariant mass distribution for oppositely charged muon candidate pairs that pass various high level triggers (HLT), using 2022 data.
Pairs of opposite-sign muons are fitted to a common vertex, using the inner detector track parameters, with a $\chi^{2} < 20$ for the one degree of freedom. The invariant mass of each pair is calculated using the offline track parameters refitted by the vertexing, and a PDG muon mass hypothesis. Different colors correspond to triggers selecting muon pairs in specific invariant mass ranges, namely $\phi(1020)$ meson (0.94-1.1 GeV), charmonium (2.5-4.3 GeV), B-hadron (4-8.5 GeV), and bottomonium (8-12 GeV). Muons are required to have pseudorapidity $|\eta| < 2.3$ and to pass "Medium" offline quality criteria. They are also required to match the objects responsible for firing the trigger ($\Delta R$ between inner detector tracks of the offline and HLT muons is required to be < 0.01). Events are selected by dimuon triggers, with one object passing a $p_{\rm T}$ threshold of 6 and the other 11 GeV. The events are recorded into a dedicated stream for B-physics and Light States that is not reconstructed offline promptly, but as available resources allow. Data quality requirements are imposed, notably on the performance of the MS and ID system.

https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2023-003.data22_13p6TeV.periodFHJ.BphysDelayed.GRL-v109-pro28-03_ignore_TRIGLAR.bDimu.png
APPROVED png file pdf file

Invariant mass distribution for oppositely charged muon candidate pairs that pass various high level triggers (HLT), using 2022 commissioning data.
Pairs of opposite-sign muons are fitted to a common vertex, using the inner detector track parameters, with a $\chi^{2} < 20$ for the one degree of freedom. The invariant mass of each pair is calculated using the offline track parameters refitted by the vertexing, and a PDG muon mass hypothesis. Different colors correspond to triggers selecting muon pairs in specific invariant mass ranges, namely $\phi(1020)$ meson (0.94-1.1 GeV), charmonium (2.5-4.3 GeV), B-hadron (4-8.5 GeV), and bottomonium (8-12 GeV). Not all ranges are continuous due to not all mass ranges being available for all selections. Muons are required to have pseudorapidity $|\eta| < 2.3$ and to pass "Medium" offline quality criteria. They are also required to match the objects responsible for firing the trigger ($\Delta R$ between inner detector tracks of the offline and HLT muons is required to be < 0.01). Events are selected by dimuon triggers, with one object passing a $p_{\rm T}$ threshold of 4, 6 or 11 GeV. The events are recorded into a dedicated stream for B-physics and Light States that is not reconstructed offline promptly, but as available resources allow. No data quality requirements are imposed due to commissioning work ongoing at the time.

https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2023-003.data22_13p6TeV.periodE.BphysDelayed.bDimu.png
APPROVED png file pdf file

Data 2018 @ 13 TeV

B-Physics trigger performance plots from 13 TeV data collected in 2018

Invariant mass distributions for oppositely charged muon candidate pairs that pass various triggers, using 2018 data
Events are reconstructed from pairs of opposite-sign muons passing "Tight" offline quality criteria, which are fit to a common vertex, using the inner detector track parameters, with a $\chi^{2} < 20$ for the one degree of freedom. Muons are also required to have $|\eta| < 2.3$ and $p_{\rm T}$ higher than the respective trigger threshold. Different colours correspond to different types of triggers with requirements on dimuon invariant mass. Events are selected using a set of dimuon triggers that require two muons at Level-1 (L1) passing thresholds of $p_{\rm T} > 4, 6, \mbox{or } 11$ GeV, which are confirmed at the High-Level Trigger (HLT). At the HLT, pairs of muons are fit to a common vertex using the inner detector track parameters. Invariant mass requirements restrict events with opposite-sign muons to phi meson, charmonium, B-hadron, and bottomonium invariant mass ranges. The "low-m" trigger collects events with very low dimuon invariant mass and no opposite sign requirement. The dashed line shows events selected by two inclusive dimuon triggers that, together, accept events with $0.1 < m(\mu^{+}\mu^{-})< 14$ GeV for for the $p_{\rm T}(\mu_{1}) > 11$ GeV, $p_{\rm T}(\mu_{2}) > 6$ GeV threshold. Triggers select specific invariant mass regions at both L1 and HLT, and due to vastly differing rates some thresholds collected a smaller integrated luminosity. Smaller invariant mass regions allow lower threshold triggers to run unprescaled at higher instantaneous luminosities, thus more signal events can be recorded than is possible with only inclusive triggers.

https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2019-040-dimuon_mass_2018.png
APPROVED png file pdf file

Data 2015 @ 13 TeV

B-Physics trigger performance plots from data collecting in 2015 in 13 TeV data

Invariant mass distributions for oppositely charged muon candidate pairs that pass various triggers.
Events are reconstructed from pairs of muons passing "Tight" offline quality criteria, which are fit to a common vertex, using the inner detector track parameters, with a $\chi^{2} < 20$ for the one degree of freedom. Muons are also required to have an absolute pseudo rapidity less than 2.3, and have transverse momentum at least that of the trigger threshold (for the single-muon trigger the thresholds of 20 and 4 GeV are used). The dimuon triggers require two muons at L1, passing thresholds of $p_{\rm T} > 4$ or 6 GeV, which are confirmed at the HLT. Pairs of oppositely charged muons are fit to a common vertex, using the inner detector track parameters, and invariant mass requirements made to restrict events to the charmonium, b-hadron and bottomonium invariant mass ranges. For comparison, the lowest threshold unprescaled single muon trigger is shown. This single-muon trigger is required to pass the 15 GeV threshold at L1, and 20 GeV at the HLT. The yields of events collected for each trigger are overlaid, where overlapping events collected by multiple triggers are retained in each histogram; hence the integral of events from all histograms is greater than the total event yield. For certain periods of running, trigger prescales were applied, reducing the effective yield of events collected by those triggers. The supporting dimuon trigger, which covers the full mass range of interest was also prescaled throughout the period of running.
https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2016-005_dimuon_2015_mass_dist.png
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Expected performance of L1Topo for Heavy Flavour physics in 2016 data

Normalised distributions of dimuon opening angle and invariant mass, as reconstructed with the granularity of L1Topo for simulated $B^{0}_{s} \rightarrow \mu\mu$ events (here) and run 212967 events (below) that pass the Level-1 2MU4 trigger. The events are binned in invariant mass $m(\mu\mu)$ and angular distance $\Delta R$ with this granularity. https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2016-006_fig1a.png
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Normalised distributions of dimuon opening angle and invariant mass, as reconstructed with the granularity of L1Topo for simulated $B^{0}_{s} \rightarrow \mu\mu$ events (above) and run 212967 events (here) that pass the Level-1 2MU4 trigger. The events are binned in invariant mass $m(\mu\mu)$ and angular distance $\Delta R$ with this granularity. https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2016-006_fig1b.png
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Trigger efficiencies binned in the dimuon invariant mass squared ($m(\mu\mu)^2$) for simulated dimuon $B^{0}_{d} \rightarrow K^{*0} \mu \mu$ events passing various di-muon L1 triggers. For each selection, the efficiencies are normalized, per $m(\mu\mu)^2$ bin, to the number of events in that bin passing offline reconstruction. The solid markers represent three different background rejection levels (50%, 86%, 96%) corresponding to the items in the optimised topological trigger menu (based on the triggers 2MU4, MU4_MU6 and 2MU6 respectively). Hollow markers represent the efficiencies for higher $p_{\rm T}$ dimuon based trigger items. https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2016-006_fig2.png
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Estimated Level-1 background and signal yield rates, at a reference instantaneous Luminosity $L_0= 5\times10^{33}{\rm cm}^{-2}{\rm s}^{-1}$, for the Run 2 Heavy Flavour L1Topo menu (filled markers ) and existing dimuon only triggers (empty markers). The menu targets three prototypical signal channels (marker shapes), using dimuon (color) and topological requirements. The signal yield rates are are calculated by scaling simulated efficiencies with rates estimated from Run 1 analyses. The $B^{0}_{s} \rightarrow \mu \mu$ signal was scaled up by $10^{3}$ for visual clarity. An additional correction by a factor of 1.5--2 is to be applied in order to scale the 7/8 TeV simulated signal samples to the centre of mass energy in Run 2 (13TeV) [ATL-PHYS-PUB-2013-010]. The background rate is estimated by scaling background efficiencies for data (run 212967) collected with the 2MU4 trigger at $\sqrt{s} = 8$ TeV and weighted to represent the reference luminosity with the corresponding absolute trigger rate. https://twiki.cern.ch/twiki/pub/AtlasPublic/BPhysicsTriggerPublicResults/ATL-COM-DAQ-2016-006_fig3.png
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Data 2010 @ 7 TeV

B-Physics trigger performance in 7 TeV data

Offline J/ψ Tracks Reconstructed by Level-2 Tracking
pT spectrum for tracks from J/ψ(µ, µ) events reconstructed offline in events with a Level-1 muon trigger. Also shown is the pT spectrum for tracks reconstructed by the Level-2 Inner Detector trigger tracking and matched to the offline track. The dashed line indicates the cut on minimum track pT imposed in both the trigger and offline J/ψ selection.

png eps
Level-2 Tracking Efficiency with J/ψ Tracks
Efficiency for the Level-2 trigger Inner Detector tracking to reconstruct tracks from offline selected J/ψ(µ, µ) in events with a Level-1 muon trigger.

png eps
Offline J/ψ Tracks Reconstructed by Event Filter Tracking
pT spectrum for tracks from J/ψ(µ, µ) events reconstructed offline in events with a Level-1 muon and passing the preceding Level-2 B-physics di-muon trigger. Also shown is the pT spectrum for tracks reconstructed by the Event Filter (Level-3) Inner Detector trigger tracking and matched to the offline track. The dashed line indicates the cut on minimum track pT imposed in both the trigger and offline J/ψ selection.

png eps
Event Filter Tracking Efficiency with J/ψ Tracks
Efficiency for the Event Filter (Level-3) trigger Inner Detector tracking to reconstruct tracks from offline selected J/ψ(µ, µ) in events with a Level-1 muon trigger and passing the preceding Level-2 B-physics di-muon trigger.

png eps
J/ψ Candidates Accepted by Level-2 B-Physics Trigger
Invariant mass distribution for offline reconstructed J/ψ(µ, µ) in events with a Level-1 muon trigger (black points). The same distribution is shown for those J/ψ where both muons are reconstructed by the Level-2 inner detector tracking algorithm (red) and where the J/ψ is found by the Level-2 B-physics di-muon trigger (yellow). To find muons, the B-physics trigger extrapolates inner detector tracks to the muon system and requires matched muon hits. A pair of oppositely charged muons is required by the di-muon trigger. (The efficiency of the B-physics trigger is expected to improve once final calibration of the track extrapolation has been done using data).

png eps
J/ψ Candidates Accepted by Event Filter B-Physics Trigger
Invariant mass distribution for offline reconstructed J/ψ(µ, µ) in events with a Level-1 muon trigger and the preceding Level-2 B-physics di-muon trigger (black points). The same distribution is shown for those J/ψ where both muons are reconstructed by the Event Filter inner detector tracking algorithm (red) and where the J/ψ is found by the Event Filter B-physics trigger for di-muons (yellow). The B-physics trigger at the Event Filter requires each muon to be reconstructed in the Muon System and this explains the drop in efficiency compared to Level-2 (which only requires matching of muon hits to an exptrapolated inner detector track) for this very low pT offline sample.

png eps

Di-muon invariant mass for B physics triggers in 2011 data

Invariant mass of oppositely charged muon candidate pairs selected by a variety of triggers.
The trigger naming convention is explained as follows
  • EF_2mu4_ denotes two muon triggers at level 1, confirmed at the high level trigger, with both objects passing a threshold of 4 GeV
  • EF_mu4mu6_ denotes two muon triggers at level 1, confirmed at the high level trigger, with one objects passing a threshold of 4 and the other 6 GeV
  • EF_mu20 denotes a single muon trigger at level 1, confirmed at the high level trigger, passing a threshold of 20GeV
  • Jpsimumu, Bmumu, Upsimumu and DiMu denote coarse invariant mass windows in the regions of the J/ψ (2.5-4.3 GeV), Bs (4-8.5 GeV) and Upsilon (8-12 GeV) and the combined range of all three (1.5-14GeV) respectively, as calculated using the trigger objects

Events are separated into samples according to which of the above triggers they fire (if an event fires several triggers it appears in several samples). For each sample pairs of high-quality (“combined”) oppositely charged muons are sought in the offline reconstruction. For a given trigger sample the offline muon pair must pass the same pT cuts as are applied in the trigger. They must also have an absolute pseudorapidity < 2.3. The selected offline muons are not required to be matched to the trigger objects responsible for firing the trigger. For each muon pair passing the selections, the associated inner detector tracks are fitted to a common vertex. The invariant mass of each pair is calculated using the track parameters refitted by the vertexing, and a PDG muon mass hypothesis. For each trigger sample, the invariant masses are plotted in separate histograms, which are then overlaid on a single mass range. Note that the EF_2mu4_DiMu trigger was prescaled for some of the later data taking, which is why it collects fewer events. The integral of the histograms will be greater than the total number of candidates collected, since the different trigger samples overlap.

https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/DiMu_mas_diff_Triggers.png
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As above in a narrower mass range https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/BPHYSICS/PUBLIC/DiMu_mas_diff_Triggers_BPhys_noLogX.png
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Major updates:
-- JoergStelzer - 13-Jun-2011 Responsible: JoergStelzer
Subject: public

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps ATL-COM-DAQ-2016-005_dimuon_2015_mass_dist.eps r1 manage 101.1 K 2016-02-25 - 10:26 JamesWalder2 Dimuon invariant mass plots for B-physics triggers from data collected in 2015 in pp collisions at 13 TeV
PNGpng ATL-COM-DAQ-2016-005_dimuon_2015_mass_dist.png r1 manage 1096.7 K 2016-02-25 - 10:26 JamesWalder2 Dimuon invariant mass plots for B-physics triggers from data collected in 2015 in pp collisions at 13 TeV
Unknown file formateps ATL-COM-DAQ-2016-006_fig1a.eps r1 manage 18.2 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
PNGpng ATL-COM-DAQ-2016-006_fig1a.png r1 manage 298.8 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
Unknown file formateps ATL-COM-DAQ-2016-006_fig1b.eps r1 manage 23.6 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
PNGpng ATL-COM-DAQ-2016-006_fig1b.png r1 manage 302.3 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
Unknown file formateps ATL-COM-DAQ-2016-006_fig2.eps r1 manage 21.2 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
PNGpng ATL-COM-DAQ-2016-006_fig2.png r1 manage 300.8 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
Unknown file formateps ATL-COM-DAQ-2016-006_fig3.eps r1 manage 16.3 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
PNGpng ATL-COM-DAQ-2016-006_fig3.png r1 manage 269.0 K 2016-02-25 - 10:38 JamesWalder2 Optimized L1Topo menu for Heavy Flavour physics ATL-COM-DAQ-2016-006
PDFpdf ATL-COM-DAQ-2019-040-dimuon_mass_2018.pdf r1 manage 241.8 K 2019-03-15 - 12:25 HeatherRussell 2018 dimuon invariant mass
PNGpng ATL-COM-DAQ-2019-040-dimuon_mass_2018.png r1 manage 45.4 K 2019-03-15 - 12:25 HeatherRussell 2018 dimuon invariant mass
PDFpdf ATL-COM-DAQ-2023-003.data22_13p6TeV.periodE.BphysDelayed.bDimu.pdf r1 manage 244.3 K 2023-02-03 - 15:07 VladimirLyubushkin1 Dimuon invariant mass plot for commissioning data 2022 at 13.6 TeV
PNGpng ATL-COM-DAQ-2023-003.data22_13p6TeV.periodE.BphysDelayed.bDimu.png r1 manage 157.8 K 2023-02-03 - 15:08 VladimirLyubushkin1 Dimuon invariant mass plot for commissioning data 2022 at 13.6 TeV
PDFpdf ATL-COM-DAQ-2023-003.data22_13p6TeV.periodFHJ.BphysDelayed.GRL-v109-pro28-03_ignore_TRIGLAR.bDimu.pdf r1 manage 111.9 K 2023-02-03 - 15:09 VladimirLyubushkin1 Dimuon invariant mass plot for data 2022 at 13.6 TeV
PNGpng ATL-COM-DAQ-2023-003.data22_13p6TeV.periodFHJ.BphysDelayed.GRL-v109-pro28-03_ignore_TRIGLAR.bDimu.png r1 manage 134.3 K 2023-02-03 - 15:09 VladimirLyubushkin1 Dimuon invariant mass plot for data 2022 at 13.6 TeV
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Topic revision: r6 - 2023-02-03 - VladimirLyubushkin1
 
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