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1 High energy photon pairs from RS-1 Gravitons: L1/HLT Studies Vladimir Litvin, Toyoko Orimoto Caltech, CMS WG4 Group Meeting 01 June 2007.

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Presentation on theme: "1 High energy photon pairs from RS-1 Gravitons: L1/HLT Studies Vladimir Litvin, Toyoko Orimoto Caltech, CMS WG4 Group Meeting 01 June 2007."— Presentation transcript:

1 1 High energy photon pairs from RS-1 Gravitons: L1/HLT Studies Vladimir Litvin, Toyoko Orimoto Caltech, CMS WG4 Group Meeting 01 June 2007

2 2 Introduction Study to investigate L1 and HLT (in)efficiencies and optimize selection for an express stream for very high energy diphoton events MC Samples: Produced at Caltech & Fermilab CMSSW_1_3_1_hlt2 with additional CVS 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 No Pileup

3 3 MC Samples Signal RS-1 G  : ~90k events (131_hlt2) and ~80k (131_hlt3) each for 750, 1250, 1000, & 1500 GeV mass samples (with c = 0.1) Background: Born: ~100k (131_hlt2) and ~100k (131_hlt3) events Box: ~300k (131_hlt2) and ~100k (131_hlt3) events CKIN(1) = 200 GeV low limit of the invariant mass of the two outgoing photons, with high end is set to infinity Done intentionally to reduce the number of events to produced while keeping the most useful part of the backgrounds for our studies. bornbox

4 4 Invariant Masses 1443.0 ± 0.3 26.6 ± 0.3 720.5 ± 0.1 15.0 ± 0.2 960.5 ± 0.2 19.9 ± 0.2 Still need energy correction Candidates reconstructed from two Island Basic Clusters from ECAL Barrel/Endcap with pt>(30) 100 GeV born box 75010001500 Pt_photons > 30 Pt_photons > 100

5 5 L1 Trigger Efficiencies (131_hlt2) # non-zero L1 bits per event L1 bits set to 1 750 GeV born box 1000 GeV 1500 GeV # non-zero L1 bits per event L1 bits set to 1

6 6 L1 Trigger Efficiencies (131_hlt3) # non-zero L1 bits per event L1 bits set to 1 750 GeV born box 1000 GeV 1500 GeV # non-zero L1 bits per event L1 bits set to 1 1250 GeV

7 7 L1 Egamma Efficiencies (131_hlt2)

8 8

9 9 L1 Egamma Efficiencies (131_hlt3)

10 10 L1 Egamma Efficiencies (131_hlt3)

11 11 HLT Efficiencies (131_hlt2) # non-zero HLT bits per event HLT bits set to 1 750 GeV born box 1000 GeV 1500 GeV # non-zero HLT bits per event HLT bits set to 1

12 12 HLT Efficiencies (131_hlt3) # non-zero HLT bits per event HLT bits set to 1 750 GeV born box 1000 GeV 1500 GeV # non-zero HLT bits per event HLT bits set to 1 1250 GeV

13 13 HLT Egamma Efficiencies 131_hlt2: 131_hlt3:

14 14 HLT Egamma Efficiencies Decrease in EG HLT efficiencies with increasing mass resonance is due to tight cut on energy deposition in HCAL for EG objects… If E > 6 GeV in HCAL for cluster from ECAL Barrel (8 GeV for ECAL Endcap), then the HLT object is considered *not* an EG object.. Currently this cut is too tight for our very high energy diphotons Use HoE cut instead…Will be implemented shortly in CMSSW_1_3_1_hlt4

15 15 Selection Invariant mass, pt cuts Shape (S1/S9, S9/S25) ECAL Isolation HCAL energy deposition Track Isolation Jets Plots will be shown for only 750 GeV sample & born and box backgrounds

16 16 ECAL S1/S9 (131_hlt2) Note: this is only for Barrel Higher energy photon Lower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

17 17 ECAL S1/S9 (131_hlt3) Note: this is only for Barrel Higher energy photon Lower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

18 18 ECAL S9/S25 (131_hlt2) Note: this is only for Barrel Higher energy photon Lower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

19 19 ECAL S9/S25 (131_hlt3) Note: this is only for Barrel Higher energy photon Lower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

20 20 ECAL Isolation (131_hlt2) Higher energy photonLower energy photon Energy from basic clusters summed within  R cone of 0.3 around basic cluster of photon candidates Pt_photons > 30 Pt_photons > 100 750 GeV born box

21 21 ECAL Isolation (131_hlt3) Higher energy photonLower energy photon Energy from basic clusters summed within  R cone of 0.3 around basic cluster of photon candidates Pt_photons > 30 Pt_photons > 100 750 GeV born box

22 22 HCAL Energy Deposit: HBHE (131_hlt2) Energy from HCAL Rechits summed within  R cone of 0.3 around basic cluster of photon candidate Higher energy photonLower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

23 23 HCAL Energy Deposit: HBHE (131_hlt3) Energy from HCAL Rechits summed within  R cone of 0.3 around basic cluster of photon candidate Higher energy photonLower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

24 24 HCAL Energy Deposit: HO (131_hlt2) Energy from HCAL Rechits summed within  R cone of 0.3 around basic cluster of photon candidate Higher energy photonLower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

25 25 HCAL Energy Deposit: HO (131_hlt3) Energy from HCAL Rechits summed within  R cone of 0.3 around basic cluster of photon candidate Higher energy photonLower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box

26 26 Tracker Isolation (131_hlt2) Higher energy photonLower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box Number of tracks (with pt >10) within  R cone = 0.3 around basic cluster of photon candidate Check also pt=[3,5] and  R=[0.4,0.5]

27 27 Tracker Isolation (131_hlt3) Higher energy photonLower energy photon Pt_photons > 30 Pt_photons > 100 750 GeV born box Number of tracks (with pt >10) within  R cone = 0.3 around basic cluster of photon candidate Check also pt=[3,5] and  R=[0.4,0.5]

28 28 Jets (131_hlt2 + pt>30 GeV) PtnJets etaphi 750 GeV born box

29 29 Jets (131_hlt3 + pt>30 GeV) PtnJets etaphi 750 GeV born box

30 30 Next Steps Production: CMSSW_1_3_1_hlt4 Produce gamma+jet and QCD backgrounds with generator preselection (working on filter now) CompHep events for 2gamma+2jets and gamma+3jets (not the top priority now) Analysis: HoE selection Energy correction

31 31 Backup Slides

32 32 All L1 Efficiencies (131_hlt2)

33 33 All L1 Efficiencies (131_hlt2)

34 34 All L1 Efficiencies (131_hlt2)

35 35 All L1 Efficiencies (131_hlt2)

36 36 All L1 Efficiencies (131_hlt2)

37 37 All L1 Efficiencies (131_hlt3)

38 38 All L1 Efficiencies (131_hlt3)

39 39 All L1 Efficiencies (131_hlt3)

40 40 All L1 Efficiencies (131_hlt3)

41 41 All L1 Efficiencies (131_hlt3)

42 42 All HLT Efficiencies (131_hlt2)

43 43 All HLT Efficiencies (131_hlt2)

44 44 All HLT Efficiencies (131_hlt2)

45 45 All HLT Efficiencies (131_hlt3)

46 46 All HLT Efficiencies (131_hlt3)

47 47 All HLT Efficiencies (131_hlt3)

48 48 Jets (131_hlt2 + pt>50 GeV) PtnJets etaphi 750 GeV born box

49 49 Jets (131_hlt2 + pt>70 GeV) PtnJets etaphi 750 GeV born box

50 50 Jets (131_hlt3 + pt>50 GeV) PtnJets etaphi 750 GeV born box

51 51 Jets (131_hlt3 + pt>70 GeV) PtnJets etaphi 750 GeV born box

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