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High energy photon pairs from RS-1 Gravitons: L1/HLT Studies

Vladimir Litvin, Toyoko Orimoto Caltech, CMS WG4 Group Meeting 01 June 2007. High energy photon pairs from RS-1 Gravitons: L1/HLT Studies. Introduction. Study to investigate L1 and HLT (in)efficiencies and optimize selection for an express stream for very high energy diphoton events

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High energy photon pairs from RS-1 Gravitons: L1/HLT Studies

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

  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. 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. born box

  4. Invariant Masses Candidates reconstructed from two Island Basic Clusters from ECAL Barrel/Endcap with pt>(30) 100 GeV 720.5 ± 0.1 15.0 ± 0.2 1443.0 ± 0.3 26.6 ± 0.3 960.5 ± 0.2 19.9 ± 0.2 750 1000 1500 Pt_photons > 30 Pt_photons > 100 box born Still need energy correction

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

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

  7. L1 Egamma Efficiencies (131_hlt2)

  8. L1 Egamma Efficiencies (131_hlt2)

  9. L1 Egamma Efficiencies (131_hlt3)

  10. L1 Egamma Efficiencies (131_hlt3)

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

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

  13. HLT Egamma Efficiencies • 131_hlt2: • 131_hlt3:

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

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

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

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

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

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

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

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

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

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

  26. Tracker Isolation (131_hlt2) Higher energy photon Lower energy photon 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] 750 GeV Pt_photons > 30 Pt_photons > 100 born box

  27. Tracker Isolation (131_hlt3) Higher energy photon Lower energy photon 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] 750 GeV Pt_photons > 30 Pt_photons > 100 born box

  28. Jets (131_hlt2 + pt>30 GeV) eta phi nJets Pt 750 GeV born box

  29. Jets (131_hlt3 + pt>30 GeV) eta phi nJets Pt 750 GeV born box

  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. Backup Slides

  32. All L1 Efficiencies (131_hlt2)

  33. All L1 Efficiencies (131_hlt2)

  34. All L1 Efficiencies (131_hlt2)

  35. All L1 Efficiencies (131_hlt2)

  36. All L1 Efficiencies (131_hlt2)

  37. All L1 Efficiencies (131_hlt3)

  38. All L1 Efficiencies (131_hlt3)

  39. All L1 Efficiencies (131_hlt3)

  40. All L1 Efficiencies (131_hlt3)

  41. All L1 Efficiencies (131_hlt3)

  42. All HLT Efficiencies (131_hlt2)

  43. All HLT Efficiencies (131_hlt2)

  44. All HLT Efficiencies (131_hlt2)

  45. All HLT Efficiencies (131_hlt3)

  46. All HLT Efficiencies (131_hlt3)

  47. All HLT Efficiencies (131_hlt3)

  48. Jets (131_hlt2 + pt>50 GeV) eta phi nJets Pt 750 GeV born box

  49. Jets (131_hlt2 + pt>70 GeV) eta phi nJets Pt 750 GeV born box

  50. Jets (131_hlt3 + pt>50 GeV) eta phi nJets Pt 750 GeV born box

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