Update on Study of Quark Compositeness in pp q * γ + Jets at CMS (on full 2011 dataset)
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1 Update on Study of Quark Compositeness in pp q * γ + Jets at CMS (on full 2011 dataset) Brajesh Choudhary, Debajyoti Choudhury, Varun Sharma University of Delhi, Delhi Sushil Singh Chauhan, Mani Tripathi University of California, Davis 1
2 Outline Signal & Background Samples Used Selection Cuts Selection Efficiency Trigger Efficiency Fake Rate MC Fake Rate Comparison Data MC Comparison Summary & Future Plans 2
3 Signal & Background Signal (γ + jet) Quark-gluon scattering (or Compton Scattering) o qg jet via q* (a) Quark-antiquark annihilation o qq jet via q* (b) gluon-gluon fusion o (C) gg g (a) (c) (b) Background SM γ + jet final state Dijet final state γ + W/Z (negligible) 3
4 Samples Used s = 7 TeV ι.dt = 4.67±0.20 fb -1 Data /Photon/Run2011A-*/AOD /Photon/Run2011B-*/AOD MC samples Summer 11 pythia samples Mass point for M q* = 1TeV Parameters o Couplings f, f, f s = 1, SM couplings o Considered u* & d* Backgrounds Photon+Jet QCD dijet Trigger Integrated Luminosity HLT_Photon75_CaloIdVL_v1 6.6 HLT_Photon75_CaloIdVL_v HLT_Photon75_CaloIdVL_v HLT_Photon125_v HLT_Photon125_v HLT_Photon135_v HLT_Photon135_v Total
5 Samples Used : Background QCD /QCD_Pt_120to170_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /QCD_Pt_170to300_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /QCD_Pt_300to470_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /QCD_Pt_470to600_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /QCD_Pt_600to800_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /QCD_Pt_800to1000_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /QCD_Pt_1000to1400_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM e e e e e e e-01 PHOTON + JET /G_Pt_120to170_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /G_Pt_170to300_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /G_Pt_300to470_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /G_Pt_470to800_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM /G_Pt_800to1400_TuneZ2_7TeV_pythia6/Summer11-PU_S3_START311_V1G1-v1/AODSIM e e e e e-03 5
6 6 Selection Cleaning Cuts Trigger Kinematic Cuts Isolation Cuts Criteria Vertex Selection Residual Spike HLT P T jet P T jet ECAL Isolation HCAL Isolation Vertex_z, z Requirement 24 cm Vertex_ndof 4.0 Vertex_rho photon crystal timing LICTD 2.0 cm < 3 ns < 5 ns HLT_Photon75_CaloIdVI_v* HLT_Photon125_v* HLT_Photon135_v* > 150 GeV < 1.44 > 150 GeV < 1.5 H/E Isolation <0.05 Trk Isolation σ iηiη < Track Veto < *P T < *P T < *P T No matching pixel seed
7 Selection Efficiency Here RefTotal is the expected events after HLT, cleaning cuts, Photon P T > 140GeV & H/E <
8 Trigger Efficiency (Barrel) HLT_Photon125 HLT_Photon135 (GeV) P T (GeV) P T 8
9 Fake Rate A Jet can fake a photon especially when most of its energy is carried by electromagnetic decay particles like π 0. Fake rate is defined as the ratio of tight fake photons over loose fake photons. Measure photon/jet fake ratio in the data as a function of E T of photon and for different triggers. Numerator : Photons passing the tight cuts [Table below]. Denominator : Photons passing all loose cuts[table below] and most of tight cuts except that it must fail atleast one of EcalIso, HcalIso or TrackIso. True photon contamination is taken care by estimating the fraction using σ iηiη templates method. Cuts Tight Loose ECAL Isolation < *P T > *P T & < 5( *P T ) HCAL Isolation < *P T > *P T & < 5( *P T ) H/E Isolation < Trk Isolation < *P T > *P T & < 5( *P T ) σ iηiη < Track Veto No matching pixel seed - 9
10 MC v/s Fake Rate MC = PhotonJet MC + DiJet MC FakeRate = PhotonJet MC + DiJet from Data Fake Rate : p0 + p1*p T *P T 10
11 Effect of Pile-up reweighting on MC Before reweighting After reweighting 11
12 Systematic Uncertainity All MC Plots are normalized to cross-section & reweighted with pileup MC has been scaled by a factor of 0.9 (LICTD & cosmic veto efficiency) Source Mean value Trigger 1.0 LICTD Cut Cosmic Muons veto Total
13 Photon P T PhotonJet MC + DiJet MC PhotonJet MC + DiJet from Data 13
14 Jet P T PhotonJet MC + DiJet MC PhotonJet MC + DiJet from Data 14
15 Photon Eta PhotonJet MC + DiJet MC PhotonJet MC + DiJet from Data 15
16 Jet Eta PhotonJet MC + DiJet MC PhotonJet MC + DiJet from Data 16
17 Mass for γ + Jet PhotonJet MC + DiJet MC PhotonJet MC + DiJet from Data 17
18 Δφ between γ & Jet 18
19 Summary & Future Plans Summary Have analyzed complete 2011 dataset i.e fb -1 MC seems to overestimate data after 300 GeV. There seems to have some issues with s3-summer11 MC samples. (Sam Harper informed about this discrepancy.) Started working with the s4-summer11 MC samples. Compared data driven fake rate to MC expectation, and they are in reasonable agreement. To do Set up limit calculation tool and systematic study. Signed up for 5 weeks of ECAL_PFG expert shifts for next year. Service task : Perform low-level ECAL analysis of anomalous or interesting events flagged by physics analysis. Provide prompt feedback to PFG/PVT and physics analysis teams. Development of common tools to analyse such events. 19
20 Back up slides 20
21 N-1 Plots for Isolation variables ECAL Iso HCAL Iso *P T *P T ECAL Isolation (in GeV) HCAL Isolation (in GeV) 21
22 N-1 Plots for Isolation variables Track Iso *P T Trk Isolation (in GeV) 22
23 Fitted Mass plot for 1 TeV sample of signal Pt Cut Signal Bkg S/ B S/B S/B for mass GeV with different Pt Cut 23 Not much difference in S/ B, So we can use higher P T selection. Repeat this with official limit calculation tools but expect similar results.
24 Selection Efficiency for signal sample of different mass points Signal samples for different Mass point 0.7 TeV 1 TeV 1.2 TeV 1.5 TeV 1.7 TeV 2 TeV 2.5 TeV 3 TeV PhotonID Photon P T Photon η ResSpike Jet P T Jet η Dphi
25 Efficiency for Photon+Jet (Bkg) with different photon P T cut 50 GeV 100 GeV Photon P T Cut 150 GeV 200 GeV 250 GeV 300 GeV 400 GeV 500 GeV PhotonID Photon P T Photon η ResSpike Jet P T Jet η Dphi
26 Photon threshold P T in GeV 26
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