1 Update: High energy photon pairs Vladimir Litvin, Toyoko Orimoto Caltech QCD Meeting 03 July 2007.

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Update: High energy photon pairs

Vladimir Litvin, Toyoko OrimotoCaltech

QCD Meeting03 July 2007

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Introduction

• Study to investigate L1 and HLT efficiencies and selection for an express stream for very high energy di-EM events

• Relevance to QCD group:

• QCD backgrounds are amongst our largest

• Recently written di-photon skim filter, part of QCDAnalysis/Skimming package

• MC Samples:

• Produced at Caltech & Fermilab (with no pileup)

• Signal RS-1 G:

• ~80-90k (131_hlt2,3,4,5) each for 750, 1250, 1000, & 1500 GeV mass samples (with c = 0.1)

• Backgrounds from irreducible qqbar & gg:

• Born: ~100k (131_hlt2,3,4,5) events

• Box: ~300k (131_hlt2) and ~100k (131_hlt3,4,5) events

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L1 Egamma Efficiencies

SingleEG ~ 100%DoubleEG ~ 96%

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L1 Egamma Efficiencies

SingleEG ~ 100%DoubleEG ~ 97%

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L1 Egamma Efficiencies

SingleEG ~ 100%DoubleEG ~ 97%

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New HLT paths in 131hlt5

• Two additional bits were added in 1_3_1_hlt5 for high energy EM stream, based on a 5% H/E cut

• HLT1EMHighEt: pt > 80 GeV and HOE < 5%

• HLT1EMVeryHighEt : pt > 200 GeV

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Next Steps

• Production:

• CMSSW_1_3_1_hlt6 (should be last)

• Produce gamma+jet and QCD backgrounds with generator preselection (working on filter now)

• Working on gamma+jets and 2gamma+jets Alpgen samples with Delhi University (S. Bhattacharia)

• Analysis:

• Try to reproduce results from PTDR

• CSA07:

• Diphoton skim for CSA07 implemented, as part of QCDAnalysis/Skimming package

• Caltech to host samples as Tier2 -- see talk last week

• Submitted all cfg files for CSA07 official production (for the RS-1 diphoton decay study)

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Backup Slides

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Releases and Tags

CMSSW_1_3_1_hlt2 with tags:• V00-00-53 HLTrigger/btau• V00-00-26 HLTrigger/xchannel• V01-06-06 RecoLocalTracker/SiPixelClusterizer• V01-00-06 L1Trigger/L1ExtraFromDigis• V02-00-06 L1Trigger/L1ExtraFromMCTruthProd• V00-00-67 HLTrigger/Configuration

CMSSW_1_3_1_hlt3 with tags:• V02-00-07 DataFormats/L1Trigger• V01-00-09 L1Trigger/L1ExtraFromDigis• V02-00-09 L1Trigger/L1ExtraFromMCTruthProd• V01-08-00-08 L1Trigger/GlobalCaloTrigger• V00-00-20-01 HLTrigger/HLTanalyzers• V00-04-06-03 HLTrigger/HLTexample• V00-00-02-02 SimCalorimetry/HcalTrigPrimProducers• V00-01-17-02 RecoTauTag/HLTProducers• V00-00-28 RecoEgamma/EgammaHLTProducers• V00-00-06 EventFilter/EcalDigiToRaw• V00-00-01-08 EventFilter/EcalRawToDigiDev• V01-01-09 DataFormats/EcalRawData• V00-00-10 Geometry/EcalMapping• V00-01-32 HLTrigger/Muon• V00-00-07-09 HLTrigger/JetMET• V00-00-33 HLTrigger/Egamma• V00-00-78 HLTrigger/btau• V00-00-40 HLTrigger/xchannel• V00-01-03 HLTrigger/Configuration

CMSSW_1_3_1_hlt4 with tags:• V00-00-20-07 L1Trigger/RegionalCaloTrigger• V00-00-34 RecoEgamma/EgammaHLTProducers• V00-03-00 RecoTracker/SpecialSeedGenerators• V00-04-10 RecoMuon/CosmicMuonProducer• V00-02-03-03 RecoMuon/TrackerSeedGenerator;• V00-07-07-05 RecoMuon/GlobalTrackFinder• V00-01-14 HLTrigger/Configuration

CMSSW_1_3_1_hlt5 with tags:• V00-01-10 Utilities/ReleaseScripts• V00-01-47 HLTrigger/Muon• V00-00-85 HLTrigger/btau• V00-00-07-15 HLTrigger/JetMET• V01-03-26 HLTrigger/HLTcore• V00-01-41 HLTrigger/Configuration

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HLT Egamma Efficiencies

New HighEt paths

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HLT Egamma Efficiencies

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HLT Egamma Efficiencies