Download - Update on Z+jets cross section at 8TeV &
Update on Z+jets cross section at 8TeV &
First look at Z+Jets double differential cross sections, dsigma/dpTdy, at 8 TeV
Buğra BilinMETU
Kittikul Kovitanggoon, Sung-Won LeeTexas Tech
Efe YazganUniversity of Ghent
2
Datasets
/*/Run2012A − 13Jul2012 − v 1/*/Run2012A −recover – 6Aug2012 – v1/*/Run2012B − 13Jul2012 − v 1/*/Run2012C − 24Aug 2012 − v 1*/Run2012C –EcalRecover –11Dec2012 – v1 /*/Run2012C − Prompt − v 2/*/Run2012D − Prompt − v 1
Datasets of 2012 *: DoubleMu(DoubleElec)
JSON from https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmV2012Analysis
Cert_190456-196531_8TeV_13Jul2012ReReco_Collisions12_JSON_v2.txtCert_190782-190949_8TeV_06Aug2012ReReco_Collisions12_JSON.txtCert_198022-198523_8TeV_24Aug2012ReReco_Collisions12_JSON.txtCert_190456-203002_8TeV_PromptReco_Collisions12_JSON_v2.txtCert_201191-201191_8TeV_11Dec2012ReReco-recover_Collisions12_JSON.txtCert_190456-208686_8TeV_PromptReco_Collisions12_JSON.txt
MC
Total Lumi:19.626 fb-1
All plots normalized to integrated luminosity
NO QCD BACKGROUND ESTIMATION YET
Cross Check Study on Central Z Jet x-sec measurement
4
Selections Triggers
HLT_Mu17_Mu8_v*HLT_Mu17_TkMu8_v*
Muon
Muon matched trigger objectsMuon pT > 20 GeV and |Muon eta| < 2.4Opposite charge muonsTight Muon ID from Muon POGLoose PF base Combined relative ISO from Muon POGZ mass window of 71 to 111 GeV
Jets
Loose Jet ID from POGTight jet PU MVAPFNo Pileup (Charge Hadron Subtraction)Jet pT > 30 GeV|Jet eta| < 2.4Clean Jets from leptonswith DeltaR<0.5
MC is ID, Iso,and trigger efficiency corrected. Official PU reweighting is used.
• Electrons
Elec matched trigger objectsElec pT > 20 GeV and |Elec eta| < 2.4Opposite charge electronsMedium Electron IDEA Corrected PF ISO < 0.152012 EA’s usedZ mass window of 71 to 111 GeV
HLT_Ele17_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_Ele8_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL*
5
Z mass
Njet
≥0 Njet
≥0
Z Properties
Muon Channel Elec Channel
6
Z phi
Njet
≥0 Njet
≥0
Z Properties
Muon Channel Elec Channel
7
Z pT
Njet
≥0 Njet
≥0
Z Properties
Muon Channel Elec Channel
8
Z Y
Njet
≥0 Njet
≥0
Z Properties
Muon Channel Elec Channel
9
Jet Multiplicity
Central region (|jet η| <2.4 )
Muon Channel Elec Channel
10
Leading jet in Central (|jet η| <2.4 )
Leading Jet pT Njet≥1
Muon Channel Elec Channel
11
SubLeading jet in Central (|jet η| <2.4 )
2nd Leading Jet pT Njet≥1
Muon Channel Elec Channel
12
Unfolding
Exclusive jet mult. (|jet η| <2.4 )
Muon Channel Elec Channel
13
Unfolding
Central region (|jet η| <2.4 )
Muon Channel Elec Channel
First Look to 2D x-sec measurement
15
Selections Triggers
HLT_Mu17_Mu8_v*HLT_Mu17_TkMu8_v*
Muon
Muon matched trigger objectsMuon pT > 20 GeV and |Muon eta| < 2.4Opposite charge muonsTight Muon ID from Muon POGLoose PF base Combined relative ISO from Muon POGZ mass window of 71 to 111 GeV
Jets
Loose Jet ID from POGTight jet PU MVAPFNo Pileup (Charge Hadron Subtraction)Jet pT > 30 GeV|Jet eta| < 4.7Clean Jets from leptonswith DeltaR<0.5
MC is ID, Iso,and trigger efficiency corrected. Official PU reweighting is used.
• Electrons
Elec matched trigger objectsElec pT > 20 GeV and |Elec eta| < 2.4Opposite charge electronsMedium Electron IDEA Corrected PF ISO < 0.152012 EA’s usedZ mass window of 71 to 111 GeV
HLT_Ele17_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_Ele8_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL*
Jet PT
Muon Channel Elec Channel
Muon Channel Elec Channel
Jet eta
CONCLUSIONS
-> Added PFNoPileUp to the seuence.
-> The general distributions are in agreement with Tomislav et. al.’s results
-> Working on unfolding as support & cross check.
-> First distributions regarding the 2D measurement shown.
->We will proceed to Unfolding.
->We have to understand the forward jets better.