2010 HI DiMuonTrigger Review preparation

Summary of the Dilepton Trigger Performance

• "HLT_L1DoubleMuOpen (which has Singles OFF in the firmeware) gives reasonable rates : will be used for run 2010
• Efficiency is high for Z (95%) and reasonable for low mass dimuons Jpsi (56%) Upsilon(76%)

• The fomula used on the estimation of Trigger efficiency
  • the option 1 : Acc X Eff = (# of Triggered events)/(# of Total events)
  • the option 2 : Trigger Efficiency = (# of Triggered events)/(# of events have the muons from signals in the |eta| < 2.4)
• The issue on the high rate of L1 emulation on the Heavy Ion collions
  • Increasing the L1 trigger bits of Muon at CMSSW_3_7_X and CMSSW_3_8_X, compared to CMSSW_3_6_2
  • At CMSSW_3_8_X the rate of L1 DoubleMuon bits has tendency to be higher than L1 SingleMuon bits
    • Detail information : L1 Rate Study on the Heavy Ion collisions
    • According to the study, the main couse came from CSC Track Finder
    • Solve this problem to turn OFF the "Singles" option on the CSC Track Finder.
• From the embedded samples (3k J/psis, Upsilons, Z0s) the trigger efficiency looks reasonable and confirmed the options "Singles ON or OFF" doesn't affect on the signals, but in the MinBias samples. For singles ON efficiency plots see L1EffSinglesON

Summary of the Rate

• Measured at CMSSW_3_8_1 with "Singles OFF" (see details of configuration here)

Summary of Efficiency for embedded samples

• In the cases of Singles ON and OFF they are exactly same, this means that the Singles OFF option dosen't affect on the trigger efficiency. The results are as below tables.

Efficiency plots for embedded samples

Z0 Trigger Efficiency

Data Sample

• 3000 Z0 Embedding samples : /castor/cern.ch/user/d/dmoon/cms381_v1/Hydjet_MinBias_2.76TeV_Z0_Flat_Emb_HLT/

Trigger Efficiency with "Singles OFF"

Acc X Eff of Z0 as pt	Trigger Efficiency of Z0 as pt

Upsilon Trigger Efficiency

Data Sample

• 3000 Upsilon Embedding samples : /castor/cern.ch/user/d/dmoon/cms381_v1/Hydjet_MinBias_2.76TeV_Upsi_Flat_Emb_HLT/

Trigger Efficiency with "Singles OFF"

Acc X Eff of Upsilon as pt	Trigger Efficiency of Upsilon as pt

J/psi Trigger Efficiency

Data Sample

• 3000 J/psi Embedding samples : /castor/cern.ch/user/d/dmoon/cms381_v1/Hydjet_MinBias_2.76TeV_Jpsi_Flat_Emb_HLT/

Trigger Efficiency with "Singles OFF"

Acc X Eff of J/psi as pt	Trigger Efficiency of J/psi as pt

-- DongHoMoon - 28 Sep 2010