Difference: BPhysicsTriggerPublicResults (1 vs. 5)

Revision 52019-03-15 - HeatherRussell

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META TOPICPARENT name="TriggerPublicResults"
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  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.
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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
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Data 2015 @ 13 TeV

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

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META FILEATTACHMENT attachment="ATL-COM-DAQ-2019-040-dimuon_mass_2018.pdf" attr="" comment="2018 dimuon invariant mass" date="1552649150" name="ATL-COM-DAQ-2019-040-dimuon_mass_2018.pdf" path="ATL-COM-DAQ-2019-040-dimuon_mass_2018.pdf" size="247599" user="hrussell" version="1"
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Revision 42016-02-25 - JamesWalder2

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Data 2015 @ 13 TeV

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

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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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Expected performance of L1Topo for Heavy Flavour physics in 2016 data

 

Data 2010 @ 7 TeV

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Revision 32016-02-22 - JamesWalder2

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META TOPICPARENT name="TriggerPublicResults"
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  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.
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Data 2015 @ 13 TeV

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

Expected performance of L1Topo for Heavy Flavour physics in 2016 data

 

Data 2010 @ 7 TeV

B-Physics trigger performance in 7 TeV data

Revision 22011-12-14 - JulieKirk

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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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Revision 12011-06-13 - JoergStelzer

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META TOPICPARENT name="TriggerPublicResults"
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B Physics 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.

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.

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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.

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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.

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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.

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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).

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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.

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Major updates:
-- JoergStelzer - 13-Jun-2011 Responsible: JoergStelzer
Subject: public
 
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