Measurement of the Jet Energy Scale in the CMS experiment ... - IIHE

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110 CHAPTER 5: Estimating of the Jet Energy Scale Calibration FactorName of Data SampleCollision Data/Electron/Run2010B-Nov4ReReco_v1/AOD/EG/Run2010A-Nov4ReReco_v1/AODSimulated Data/TTJets_TuneD6T_7TeV-madgraph-tauola/Fall10-START38_V12-v2/AODSIM/WJetsToLNu_TuneD6T_7TeV-madgraph-tauola/Fall10-START38_V12-v1/AODSIM/DYJetsToLL_TuneD6T_M-50_7TeV-madgraph-tauola/Fall10-START38_V12-v2/AODSIM/TToBLNu_TuneZ2_s-channel_7TeV-madgraph/Fall10-START38_V12-v1/AODSIM/TToBLNu_TuneZ2_t-channel_7TeV-madgraph/Fall10-START38_V12-v2/AODSIM/TToBLNu_TuneZ2_tW-channel_7TeV-madgraph/Fall10-START38_V12-v2/AODSIM/QCD_Pt-20to30_BCtoE_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/AODSIM/QCD_Pt-30to80_BCtoE_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/AODSIM/QCD_Pt-80to170_BCtoE_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/AODSIM/QCD_Pt-20to30_EMEnriched_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/AODSIM/QCD_Pt-30to80_EMEnriched_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/AODSIM/QCD_Pt-80to170_EMEnriched_TuneZ2_7TeV-pythia6/Fall10-START38_V12-v1/AODSIMTable 5.14: The list of collision data samples and simulated data sets which are usedto evaluate the performance of the simulation.
CHAPTER 5: Estimating of the Jet Energy Scale Calibration Factor 111tigate if the method works on the smaller amount of collected events. This is checkedin the following.5.6.1 Event Selection CutsThe baseline event selection cuts developed in the Top Quark Analysis Group withinthe CMS collaboration are used for this part of the study. They are collected in [104]and are summarized below.• The collision data has been collected using different trigger requirements dependingon the various runs performed during the data taking period. Collision eventsare asked to have at least one reconstructed electron with a minimal cut on thetransverse momentum exceeding 15 GeV. The cut on the electron transverse momentumbecomes tighter for some of the runs. Besides applying a cut on thetransverse momentum of the reconstructed electron, some identification criteriaare also checked for the reconstructed electron varying run by run. The event iskept if there is a reconstructed electron passing the p T cut and the identificationrequirements. No trigger criteria are applied on the simulated data samples.• In order to reduce the huge amount of statistics, a set of pre-selection cuts isapplied. All events are required to contain at least one reconstructed electronwith p T > 15 GeV and four reconstructed jets, each of which has a transversemomentum exceeding 20 GeV . The reconstructed electron and jets are asked tobe within the tracker acceptance of |η| < 2.4.• The next cut in the series of the event selection cuts, is to apply quality cuts onthe reconstructed vertex of the event. The primary vertex of the event is askedto be reconstructed close to the nominal interaction point. At least five tracksshould contribute to reconstruct the vertex, ndof > 4, and also it is required tohave |z| < 24 cm and ρ < 2 cm relative to nominal centre of the detector. Thedefinitions of these parameters were given in Section 4.4.1.• The event is asked to have exactly one isolated electron passing the criteria listedbelow.– In order to reject the electrons which are reconstructed within jets, thecandidate electron is required to be reconstructed very close to the primaryvertex. The absolute value of the difference between the z-component of thereconstructed electron and the z-component of the primary vertex of theevent is required to be less than one centimeter.– The threshold cut on the transverse energy of the candidate electron is increasedcompared to the cut applied in pre-selection step. The reconstructedelectron is needed to have E T > 30 GeV .– The threshold cut on the pseudorapidity of the candidate electron is notchanged with respect to the cut applied in pre-selection step. As an extrarequirement, the electron is asked to be reconstructed outside of thetransition region between the ECAL barrel and the ECAL endcap.
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Vrije Universiteit BrusselFaculteit
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IntroductionThe Standard Model of p
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Chapter 1The Standard Model of Part
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Chapter 2The CMS experiment at the
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Chapter 3Object ReconstructionThe e
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Page 141 and 142: SummaryJets appear in the final sta
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Measurement of the Jet Energy Scale in the CMS experiment ... - IIHE

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