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Archana Sharma, Suman Beri Panjab University Chandigarh

Updates on the RPC trigger efficiency work with data driven method and Muon trigger efficiencies with Tag & Probe. Archana Sharma, Suman Beri Panjab University Chandigarh. Plan of talk. RPC trigger efficiencies with Data Driven method. Analysis features Brief description of method

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Archana Sharma, Suman Beri Panjab University Chandigarh

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  1. Updates on the RPC trigger efficiency work with data driven method and Muon trigger efficiencies with Tag & Probe Archana Sharma, Suman Beri Panjab University Chandigarh India-CMS meeting TIFR, Jan. 2011

  2. Plan of talk • 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 India-CMS meeting TIFR, Jan. 2011

  3. A Data Driven trigger performance evaluation method • 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-system • By considering the trigger candidates provided by a given sub-detector using its complementary one as reference. • Motivation • Such method is relevant in cross section calculation scenarios, for trigger efficiency evaluation unbiased by MC guesses India-CMS meeting TIFR, Jan. 2011

  4. Analysis Features • CMSSW version : 3_8_4_patch4 • MC 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. 2011

  5. 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. India-CMS meeting TIFR, Jan. 2011

  6. Some plots of RPC trigger system efficiency with eta cuts only |eta|<0.2, 0.33<|eta|<0.56, 0.76<|eta|<0.97 for negative muons for positive muons India-CMS meeting TIFR, Jan. 2011

  7. Phi binning = 10 degree for negative muons for positive muons India-CMS meeting TIFR, Jan. 2011

  8. Pt binning = 10 GeV/c for negative muons for positive muons India-CMS meeting TIFR, Jan. 2011

  9. Applied the different sets of phi cuts for positive and negative muons to rule out the geometric cracks along different sectors in phi for negative muons for positive muons India-CMS meeting TIFR, Jan. 2011

  10. for positive muons for negative muons India-CMS meeting TIFR, Jan. 2011

  11. for positive muons for negative muons India-CMS meeting TIFR, Jan. 2011

  12. Summary • 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. India-CMS meeting TIFR, Jan. 2011

  13. Efficiencies of HLT_Mu9 , HLT_Mu11 & HLT_Mu15 triggers with Tag & Probe India-CMS meeting TIFR, Jan. 2011

  14. Overview of Tag and Probe Method • 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: Tag • Paired with tag to fulfill resonance mass window: probe (loose selection criteria) ε= Npass/ Npass + Nfail India-CMS meeting TIFR, Jan. 2011

  15. Analysis Features : • CMSSW version used : 3_8_4 • MC sample used : /DYToMuMu_M-20_CT10_TuneZ2_7TeV-powheg-pythia/Fall10-START38_V12-v1/GEN-SIM-RECO • Data sample used : • /Mu/Run2010A-WZMu-Sep17Skim_v1/RAW-RECO •  /Mu/Run2010B-PromptReco-v2/RECO India-CMS meeting TIFR, Jan. 2011

  16. Selection criteria on Tag & Probe • Cuts on Tag : • Pt >20 GeV • |eta| < 2.1 • Passing VBTF cuts (no isolation) • Cuts on Probe : • Pt > 20 GeV • |eta| < 2.1 • Passing VBTF cuts (no isolation) • HLT_Mu9 – unprescaledupto run 147116 • HLT_Mu11- unprescaledupto run 148058 • HLT_Mu15_v1- unprescaled for all run range used in the present study India-CMS meeting TIFR, Jan. 2011

  17. Efficiency of HLT_Mu9 wrt eta for all Pt range India-CMS meeting TIFR, Jan. 2011

  18. Efficiency of HLT_Mu9 wrt Pt for all Eta range India-CMS meeting TIFR, Jan. 2011

  19. Efficiency of HLT_Mu11 wrt eta for all Pt range India-CMS meeting TIFR, Jan. 2011

  20. Efficiency of HLT_Mu11 wrt Pt for all Eta range India-CMS meeting TIFR, Jan. 2011

  21. Efficiency of HLT_Mu15_v1 wrt eta for all Pt range For real data India-CMS meeting TIFR, Jan. 2011

  22. Efficiency of HLT_Mu15_v1 wrt Pt for all Eta range For real data India-CMS meeting TIFR, Jan. 2011

  23. Summary • 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. India-CMS meeting TIFR, Jan. 2011

  24. Next Plans 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. India-CMS meeting TIFR, Jan. 2011

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