Monday 28th, Multilepton Meeting present L3 Trigger Efficiency

1
Search for Chargino and Neutralino

• L3 Trigger efficiency for dimuon triggers
• cleaning up the sample
• matching muons to the online object by using the
  L3Summary Block as online collection
• measuring the trigger efficiency vs muon pt

• Monday 28th, Multilepton Meeting present L3
  Trigger Efficiency
• Monday 5th, Multilepton Meeting present L1L2
  Trigger Efficiency

2
DIMUON Trigger Path in PHYSICS_1_05_v-8

• Dimuon_cmu4_cmx4
• Dimuon_cmu4_cmx4_L2_trk8_L1_cmup6_pt4
• Dimuon_cmucmu4
• Dimuon_cmucmu4_L2_trk8_L1_cmup6_pt4
• Dimuon_cmup4_cmx4
• Dimuon_cmupcmup4

• Need efficiency per
• Cmu muon
• Cmup muon
• Cmx muon

3
CMUPCMUP4 Trigger

• TRIGGER REQUIREMENTS
• Path DIMUON_CMUPCMUP4_v-1
• L1L1_TWO_CMU1.5_PT1.5
• cmu stub pT 1.5 GeV
• cmu xft pT 1.5 GeV
• L2L2_AUTO_L1_TWO_CMU1.5_PT1.5
• L3L3_DIMUON_CMUPCMUP4
• cmpDx 20.0 cm
• cmuDx 15.0 cm
• minPT 4.0 GeV
• selectCMUP true
• nMuons 2

4
Muon Calib Sample

• Muon Calib Sample (stream B) bmcl0d
• Path MUON_CMUP8_v-9
• L1L1_CMUP6_PT4
• CMU_stub_PT 6 Gev
• CMU_XFT_PT 4.09 GeV
• require CMP
• L2L2_CMUP6_PT_8
• XFT layers 4
• XFT PT 8 GeV
• L3L3_MUON_CMUP8
• cmpDx 20.0 cm
• cmuDx 15.0 cm
• minPT 8.0GeV

5
Bias removal

• For each event,
• L1 L1_TWO_CMU1.5_PT1.5 bit ON
• 17 events
• at least one cmup8 object in the ONLINE
  collection
• cosmics removal

6
Bias removal

• If 2 cmup8 object in the ONLINE collection, all
  OFFLINE object are unbiased
• If 1 cmup8 object in the ONLINE collection,
• for each ONLINE muon
• Matching to the OFFLINE object (no requirements)
  based on track information (DR) identification
  of biased muons in the event
• if 2 biased muons, the muon with the best match
  in DR is removed from the OFFLINE collection
• If 1 biased muon, removed from the OFFLINE
  collection
• If 0 biased muon, matching of the OFFLINE object
  based on stub information (DF) if any, matching
  muon is removed from the OFFLINE collection

7
Matching variable
8
Pt distribution for all muons vs unbiased muons
All offline muons (x 102)
Offline unbiased muons (x (1/50))
9
Muon identification

• In the list of cmup8-unbiased muons, the cmup4
  candidate muon satisfies

• HasCmuStub HasCmpStub
• nStSeg and nAxSeg COT(BC) gt3 (gt5 hits)
• EmEnergy lt 1.0 GeV (will be changed to 2 GeV?)
• HadEnergy lt 4.0 GeV
• EmEnergy HadEnergy gt 0.1 GeV
• Corrected d0 lt 0.2 cm
• Cmu stub Dx lt 3 cm Cmp stub Dx lt 5 cm
• Calorimeter Iso lt 0.1

10
Pt distribution for candidate muons
All offline candidate muons
All candidate muons passing the trigger (8519)
11
Muon based efficiency

• Muon based efficiency
• Subsample of unbiased muons
• If muon is identified and satisfies L3
  requirements (candidate muon)
• If a muon triggers L3 (triggering muon)
• Efficiency triggered muons / candidate muons
• e 98.5 0.2

12
Eff per cmup4 muon vs pT
Plateau e 98.5 0.2
13
CMUP4_CMX4 Trigger

• TRIGGER REQUIREMENTS
• Path DIMUON_CMUP4_CMX4_v-1
• L1L1_CMU1.5_PT1.5__CMX1.5_PT2_CSX
• cmu stub pT 1.5 GeV
• cmu xft pT 1.5 GeV
• cmx stub pT 1.5 GeV
• cmx xft pT 2 GeV and require CSX
• L2L2_AUTO_L1_CMU1.5_PT1.5__CMX1.5_PT2_CSX
• L3L3_DIMUON_CMUPCMUP4
• cmpDx 20.0 cm
• cmuDx 15.0 cm
• minPT 4.0 GeV
• cmxDx 30.0 cm
• minPT 4.0 GeV

14
Eff per cmx4 muon vs pT
15
PT distribution for cmx4 muons
16
Event Efficiency

• Event based efficiency
• If event has L1_TWO_CMU1.5_PT1.5 fired
• If event has gt1 candidate muons candidate evt
• If event has L3_DIMUON_CMUPCMUP4 fired
  triggered evt
• Efficiency triggered evts / candidate evts
• e 100