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Status of Muon Trigger Efficiency Measurement for ICHEP

Status of Muon Trigger Efficiency Measurement for ICHEP. Benedikt Hegner , Benjamin Klein, Yvonne Küssel , Patricia Lobelle , Markus Marienfeld , Rahmat Rahmat , Laria Redjimi , Jason Slaunwhite , Sinéad Walsh. Trigger Performance Group meeting 21 June 2010. Plans.

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Status of Muon Trigger Efficiency Measurement for ICHEP

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  1. Status of Muon TriggerEfficiencyMeasurementfor ICHEP BenediktHegner, Benjamin Klein, YvonneKüssel, Patricia Lobelle, MarkusMarienfeld, RahmatRahmat, LariaRedjimi, JasonSlaunwhite, SinéadWalsh Trigger Performance Group meeting 21 June 2010

  2. Plans • Roadmap as shown in Jason's talk on 29th of April (slides) • Step1: ~21 May • Total efficiencywith error largeenoughtocoveranyobservedvariation in eta/pt • Step2: ~week of 7 june • Coarseparameterisation of thetriggerefficiency We are close to the initial schedule (slowed down by limited statistics) • Step3: ~end of june • Tag & probewith Z-> mmfrom data • See status reportspresentedbyBenjamin (27 May, slides) and Yvonne (15 June, slides) • Resultscollected in ourtwiki page: https://twiki.cern.ch/twiki/bin/view/CMS/TopMuTrigEff4ICHEP Goal: provide muon triggerefficiencymeasurementfor top analyses Basedonminbias & jet trigger data

  3. Datasets • JetMETTautriggeredsamples • /MinimumBias/Commissioning10-SD_JetMETTau-v9/RECO Runs: 135059, 135149, 135175, 135445, 135521, 135523, 135525, 135528, 135534, 135535, 135537, 135573, 135575, 135735 • /JetMETTau/Run2010A-May27thReReco_v1/RECO Runs: 136033, 136035, 136066, 136080, 136082, 136087, 136088, 136097, 136098 , 136100, 136119, 136294, 136297 ~ 17 nb-1 • Skim • – At least one muon of any kind (global/tracker/standalone) with Pt>5 GeV • – Scraping Veto && Primary vertex filter • – HltPhysicsDeclared (next iteration only relying on good LS) •  AfterSkimming: 34677 events

  4. Muon selection & efficiencydefinition isGlobalMuon && isTrackerMuon Chi2< 10 NvalidMuonHits>0 d 0 <0.2 N hits>=11 RelIso <0.05  No iso cut applied now pT > 5GeV Eta<2.4 • Muon selection as close to the top mu+jets reference as possible with the current available statistics • Currently studying more muon clean-up cuts • Cross check with what’s being done in Muon POG & VBTF Efficiency definition fraction of good selected muons matched to HLT muons in dR<0.2 Matching ~99% efficient • Study HLT_Mu5 • - HLT_Mu9 whenwehave more statistics

  5. HLT_Mu5 Efficiency vs pt, h Overlap Overlap CSC DT CSC

  6. Efficiency vs somecut variables Data vs MC Jet multiplicity Jet definition: Ak5 caloJets Et>30 EmEnergyFraction>0.01 N90hits>1 fHPD<0.98

  7. Additional cuts applied (recommened by Muon POG) on top of the reference selection • to reject punch through and decays in flight S.Walsh Referenceselection Onslide 4

  8. Some more efficiencyplots vs cut variables, comparingthis new selectionwiththeoldone S.Walsh

  9. Comparisonwithttbar MC J.Slaunwhite • Muon trigger efficiency for high-pt muons from ttbar • Non-isolated muons to increase statistics, • Average efficiency is 94% Chi2< 10 d 0 <0.2 N hits>=11 pT > 10GeV Eta<2.4 Sample: /CMSSW_3_6_1/RelValTTbar/GEN-SIM-RECO/MC_36Y_V7A-v1/ - Prompt ttbarmuons are different from the non-prompt muons that exist in the data we've collected so far - We don't necessarily expect the efficiency to be the same without clean up cuts - Studies of clean-up cuts under investigation

  10. General recommendationstobeused in top analyses • Triggers used in top analyses - Muon channels: HLT_Mu9 - Electron channels: HLT_Photon10_L1R up to now, HLT_Photon10_Cleaned_L1R from now on (switch to HLT_Photon15_Cleaned_L1R when it has to be prescaled) • Should we in addition request any other bits (e.g. BSC beam-halo veto on 36||37||38|39 etc ? • Should we request the trigger also in MC or not ask for the HLT bit in MC, but just apply a global scale factor for the inefficiency observed in data (inclusively) ?

  11. Summary • HLT_Mu5 efficiency measurement available • Results are being posted in https://twiki.cern.ch/twiki/bin/view/CMS/TopMuTrigEff4ICHEP • Reasonable agreement with MC • Will compare with similar studies performed in other groups (Muon POG, VBTF) to understand possible differences • …

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