India CMS meeting : BARC, Mumbai : August 2012Brajesh Choudhary, Debajyoti Choudhury, Varun Sharma...

Brajesh Choudhary, Debajyoti Choudhury, Varun Sharma University of Delhi, Delhi

Sushil Singh Chauhan, Mani Tripathi

University of California, Davis

India CMS meeting : BARC, Mumbai : August 2012

Signal & Background. Changes w.r.t 2011 Analysis. Samples Used and Selection Criteria. S3-S4 MC & 42X-44X Data Sample Comparison. Pythia-Madgraph Comparison. Trigger & Selection Efficiency. Data/MC Comparison. Present Status & Service Work.

August 3, 2012 2 India-CMS meeting : BARC, Mumbai : Varun Sharma

Signal (γ + jet) Quark-gluon scattering ( or Compton Scattering)

▪ via q* (a) Quark-antiquark annihilation

▪ via q* (b) Gluon-gluon fusion

▪ gg → γg (c)

Standard Model Backgrounds γ + jet final state Dijet final state γ + W/Z (negligibly small)

August 3, 2012

jetqq

jetqg (a)

(b) (c)

3 India-CMS meeting : BARC, Mumbai : Varun Sharma

MC : Switched to S4 MC samples. Data : moved to ReReco samples(44X )

Moved to new Photon ID recommended by Egamma

group. Applied a veto on sub-leading jet. Compared Pythia MC samples with Madgraph MC

samples.

Did few checks for optimization of different cuts Varied eta cut Varied Delta phi cut Tried to see the effect of Missing ET cut. Asymmetric cuts for photon & jet PT.

Corrected the cross-section for 1Tev signal sample(Wrong information on PREP page).


√s = 7 TeV ∫L.dt = 4.9 0.22fb-1

Data

/Photon/Run2011A-*/AOD /Photon/Run2011B-*/AOD

MC Samples Summer 11 pythia samples Mass point for Mq*

= 1TeV Parameters

▪ Couplings f,f’,fs =1, SM couplings ▪ Considered u* & d*

Backgrounds

Photon + Jet DiJet

Trigger Used

HLT_Photon75_CaloIdVL_v1



HLT_Photon125_v1

HLT_Photon125_v2

HLT_Photon135_v1

HLT_Photon135_v2


ECAL Isolation < 4.2 + 0.006*PT + 0.1830*Rho

HCAL Isolation < 2.2 + 0.0025*PT + 0.0620*Rho

Track Isolation < 2.0 + 0.0001*PT + 0.0167*Rho

H/E <0.05

σiηiη < 0.013

Track veto No matching pixel

Vertex selection

Vertex_z, |z| <= 24cm

Vertex_ndof >= 4.0

Vertex_rho <= 2.0cm

Residual Spike Photon crystal timing < 3ns

LICTD < 5ns

August 3, 2012

Photon PT > 150 GeV

Photon |η| < 1.44

Jet PT > 150 GeV

Jet |η| < 1.5


MC Samples Cross-section (pb-1)

Photon+Jet

/G_Pt-120to170_TuneZ2_7TeV_pythia6/Summer11-PU_S4_START42_V11-v1/AODSIM 84.2





Dijet

/QCD_Pt-120to170_TuneZ2_7TeV_pythia6/Summer11-PU_S4_START42_V11-v1/AODSIM 115000.0








https://cmsweb.cern.ch/das/request?input=dataset=/G_Pt-80to120_TuneZ2_7TeV_pythia6/Summer11-PU_S4_START42_V11-v1/AODSIM&instance=cms_dbs_prod_global




































https://cmsweb.cern.ch/das/request?input=dataset=/QCD_Pt-120to170_TuneZ2_7TeV_pythia6/Summer11-PU_S4_START42_V11-v1/AODSIM&instance=cms_dbs_prod_global

















































August 3, 2012

S4 MC samples looks mostly similar to S3 with fluctuations of 2% in diff pt bins


August 3, 2012

PhotonJet MC

Data

Photon PT Jet PT


August 3, 2012

Photon PT Jet PT

Compared the total background (Photon+Jet and Dijet) MC using Pythia and Madgraph. Expectedly, shapes of Madgraph and Pythia matches, with Madgraph slightly being on the higher side.


August 3, 2012

Selection efficiencies

Trigger Turn-On curves

HLT_Photon125 HLT_Photon135

Pythia MadGraph

Photon PT Photon PT


Signal (34607.5 )

Total Bkg (594847776)

Data (1.01143e+07)

Phot150_Jet50 5208.12 97174 109646

Phot150_Jet130 5182.92 81670.7 85465

Phot150_Jet140 5182.32 75667.7 78036

Phot150_Jet150_eta1.5 5172.14 68290.8 69666

Phot150_Jet150_Met20 1684.17 38507 34664

Phot150_Jet150_SJ50 2996.84 49996.8 48515

Phot150_Jet150_eta25 7004.66 82525.8 84701

Phot150_Jet150_eta25_SJ50 4194.42 60583.7 58885

August 3, 2012

Source Mean value

Trigger 1.0

LICTD Cut 0.969

Cosmic Muons veto 0.934

Total 0.905

Data/MC Scaling Factors


August 3, 2012

Madgraph Bkg

Pythia Bkg

Photon PT Jet PT


August 3, 2012

Pythia Bkg

Photon η Jet η

Madgraph Bkg


August 3, 2012

Pythia Bkg Madgraph Bkg


Analyzed complete 2011 dataset i.e 4.9fb-1. Data/MC seems to agree reasonably.

Used Pythia and Madgraph MC samples to cross check

results. Estimated QCD using data driven methods.

Optimized different selection criteria and calculated

various scaling factors. Working on PDF uncertainity, other systematic

uncertainities and Limit Calculation(almost done).

Waiting for 2012 signal samples Started working on 2012 MC samples : they were done a

couple of weeks back only


DAQ Shifts (32) (1.49 mo)

ECAL PFG Shifts ( 2 weeks) (0.65 mo)

Tutor for PAT Tutorial held from 2nd July to 7th July 2012 at CERN (2 weeks) (0.5 -1.0 mo)

ECAL DPG Task : Working on Low-level analysis of problematic/interesting events flagged by Physics. (15 days) (0.4mo)

August 3, 2012

Continue working on ECAL DPG Task ~ 1 month ECAL PFG Shifts : 2weeks

Jan-July 2012

Aug-Dec 2012

Sub-total : 3.04-3.54 months

Total : 4.7-5.2 months


August 3, 2012

Before reweighting After reweighting


August 3, 2012

Fake Rate : p0 + p1*PT*PT

MC = PhotonJet MC + DiJet MC FakeRate = PhotonJet MC + DiJet from Data


MC Samples Cross-section (pb-1)

Photon+Jet

/GJets_TuneZ2_40_HT_100_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM

25690.0

/GJets_TuneZ2_100_HT_200_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM

5213.0

/GJets_TuneZ2_200_HT_inf_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM

798.3

Dijet

/QCD_TuneZ2_HT-100To250_7TeV-madgraph/Summer11-PU_S4_START42_V11-v2/AODSIM

4194000.0


198500.0


5856.0

/QCD_TuneZ2_HT-1000_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM 122.6


https://cmsweb.cern.ch/das/request?input=dataset=/GJets_TuneZ2_40_HT_100_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM&instance=cms_dbs_prod_global















https://cmsweb.cern.ch/das/request?input=dataset=/GJets_TuneZ2_200_HT_inf_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM&instance=cms_dbs_prod_global







https://cmsweb.cern.ch/das/request?input=dataset=/QCD_TuneZ2_HT-100To250_7TeV-madgraph/Summer11-PU_S4_START42_V11-v2/AODSIM&instance=cms_dbs_prod_global



























https://cmsweb.cern.ch/das/request?input=dataset=/QCD_TuneZ2_HT-1000_7TeV-madgraph/Summer11-PU_S4_START42_V11-v1/AODSIM&instance=cms_dbs_prod_global









India CMS meeting : BARC, Mumbai : August 2012Brajesh Choudhary, Debajyoti Choudhury, Varun Sharma...

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