Post on 02-Jan-2016
Archana Sharma, Suman Beri
Panjab University
Chandigarh
India-CMS meeting TIFR, Jan. 20111
Updates on the RPC trigger efficiency work with data driven method and Muon trigger
efficiencies with Tag & Probe
Plan of talk
India-CMS meeting TIFR, Jan. 20112
RPC trigger efficiencies with Data Driven method. Analysis features Brief description of method Some efficiency plots Summary
Muon trigger efficiencies with official Tag & Probe method Analysis features Brief description of Tag & Probe method Selection cuts for Tag & Probe Trigger Efficiencies plots Summary
A Data Driven trigger performance evaluation method
India-CMS meeting TIFR, Jan. 20113
GMT algorithm keeps trace of the muon sub-system which provided the candidates measurement(s)
Such feature can be exploited for evaluating in a data-driven fashion the trigger performance of each muon sub-systemBy considering the trigger candidates provided by a given sub-detector
using its complementary one as reference.
MotivationSuch method is relevant in cross section calculation scenarios, for trigger
efficiency evaluation unbiased by MC guesses
Analysis Features
India-CMS meeting TIFR, Jan. 20114
CMSSW version : 3_8_4_patch4MC sample /WToMuNu_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/GEN-SIM-
RAW
Data Sample/Mu/Run2010B-WZMu-v2/RAW-RECO
Results of the Data driven efficiencies for RPC trigger system with MC sample and real data were compared.
India-CMS meeting TIFR, Jan. 20115
Three types of efficiencies curves for the DT and RPC trigger system :
For data driven efficiency with MC and real data
– all the events with GMT candidates provided by the DT’s in barrel
– amongst these, the number of events with candidates provided also by RPC is counted up.
For Data Reco efficiency
– all the L2 muons
– amongst these the number of events with Candidates provided by RPC is counted up.
Some plots of RPC trigger system efficiency with eta cuts only
India-CMS meeting TIFR, Jan. 20116
|eta|<0.2, 0.33<|eta|<0.56, 0.76<|eta|<0.97
for negative muons for positive muons
Applied the different sets of phi cuts for positive and negative muons to rule out the geometric cracks along different sectors in phi
India-CMS meeting TIFR, Jan. 20119
for negative muons for positive muons
Summary
India-CMS meeting TIFR, Jan. 201112
Efficiencies before applying phi cuts :
Efficiency after applying phi cuts :
Phi cuts improve the matching between the curves for MC and real data as well as the efficiencies.
RPC Trigger efficiency curves after cuts show flat behaviour with respect to transverse momentum except low momentum.
Data driven efficiency with MC
Data driven eff with real data
Eff with reco muons for real data
For positive muons 87.79 0.06% 83.95 0.63% 84.32 0.61%
For negative muons 87.97 0.08% 83.01 0.74% 83.57 0.72%
Data driven efficiency with MC
Data driven eff with real data
Eff with reco muons for real data
For positive muons 95.14 0.06% 93.96 0.56% 94.06 0.56%
For negative muons 95.23 0.07% 93.87 0.63% 94.05 0.61%
Efficiencies of HLT_Mu9 , HLT_Mu11 & HLT_Mu15 triggers with Tag & Probe
India-CMS meeting TIFR, Jan. 201113
Overview of Tag and Probe Method
India-CMS meeting TIFR, Jan. 201114
Tag and Probe method is a data-driven approach to estimate the efficiencies of the different processes which involves a particle reconstruction in a detector.
Very tight selection criteria: TagPaired with tag to fulfill resonance
mass window: probe (loose selection criteria)
ε = Npass/ Npass + Nfail
Analysis Features :
India-CMS meeting TIFR, Jan. 201115
CMSSW version used : 3_8_4MC sample used :
/DYToMuMu_M-20_CT10_TuneZ2_7TeV-powheg-pythia/Fall10-START38_V12-v1/GEN-SIM-RECO
Data sample used :1) /Mu/Run2010A-WZMu-Sep17Skim_v1/RAW-RECO
2) /Mu/Run2010B-PromptReco-v2/RECO
Selection criteria on Tag & Probe
India-CMS meeting TIFR, Jan. 201116
Cuts on Tag :
1) Pt >20 GeV
2) |eta| < 2.1
3) Passing VBTF cuts (no isolation)Cuts on Probe :
1) Pt > 20 GeV
2) |eta| < 2.1
3) Passing VBTF cuts (no isolation)HLT_Mu9 – unprescaled upto run 147116HLT_Mu11- unprescaled upto run 148058HLT_Mu15_v1- unprescaled for all run range used in the
present study
Efficiency of HLT_Mu15_v1 wrt eta for all Pt range
India-CMS meeting TIFR, Jan. 201121
For real data
Efficiency of HLT_Mu15_v1 wrt Pt for all Eta range
India-CMS meeting TIFR, Jan. 201122
For real data
Summary
India-CMS meeting TIFR, Jan. 201123
Efficiencies are summarized as :
Significant matching between data and MC efficiency curves. There is a drop in efficiency for the eta region 1.05<|eta|<1.2
which is the overlap region. Drop in efficiency is more prominent for HLT_Mu9 (~70%)
for both positive and negative eta regions where as for other two triggers a prominent drop is there for negative overlap region but not for positive overlap region.
Trigger names Efficiencies with MC
Efficiencies with real data
HLT_Mu9 95.25 ± 0.028% 89.90 ± 0.50 %
HLT_Mu11 95.25 ± 0.028% 92.32 ± 0.31 %
HLT_Mu15_v1 - 92.61 ± 0.20 %
Next Plans
India-CMS meeting TIFR, Jan. 201124
RPC trigger efficiency work :Further optimize the eta and phi cuts for real data.Study of DT trigger system efficiency with data driven method.
Muon trigger efficiency work :Study of efficiency drop in overlap region.Study of efficiency for |eta| region from 2.1 to 2.4.To calculate the trigger efficiency at L1 and HLT level
separately with Tag & Probe.