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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 Bilin METU Kittikul Kovitanggoon, Sung-Won Lee Texas Tech Efe Yazgan University of Ghent. Datasets. Datasets of 2012 *: DoubleMu(DoubleElec).

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Update on Z+jets cross section at 8TeV &

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  1. Update on Z+jets cross section at 8TeV & First look at Z+Jets double differential cross sections, dsigma/dpTdy, at 8 TeV Buğra Bilin METU Kittikul Kovitanggoon, Sung-Won Lee Texas Tech Efe Yazgan University of Ghent

  2. Datasets • Datasets of 2012 *: DoubleMu(DoubleElec) /*/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 Total Lumi:19.626 fb-1 All plots normalized to integrated luminosity • JSON from https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmV2012Analysis Cert_190456-196531_8TeV_13Jul2012ReReco_Collisions12_JSON_v2.txt Cert_190782-190949_8TeV_06Aug2012ReReco_Collisions12_JSON.txt Cert_198022-198523_8TeV_24Aug2012ReReco_Collisions12_JSON.txt Cert_190456-203002_8TeV_PromptReco_Collisions12_JSON_v2.txt Cert_201191-201191_8TeV_11Dec2012ReReco-recover_Collisions12_JSON.txt Cert_190456-208686_8TeV_PromptReco_Collisions12_JSON.txt • MC NO QCD BACKGROUND ESTIMATION YET 2

  3. Cross Check Study on Central Z Jet x-sec measurement

  4. Selections • Triggers HLT_Mu17_Mu8_v* HLT_Mu17_TkMu8_v* HLT_Ele17_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_Ele8_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL* • Muon • Electrons Muon matched trigger objects Muon pT > 20 GeV and |Muon eta| < 2.4 Opposite charge muons Tight Muon ID from Muon POG Loose PF base Combined relative ISO from Muon POG Z mass window of 71 to 111 GeV Elec matched trigger objects Elec pT > 20 GeV and |Elec eta| < 2.4 Opposite charge electrons Medium Electron ID EA Corrected PF ISO < 0.15 2012 EA’s used Z mass window of 71 to 111 GeV • Jets Loose Jet ID from POG Tight jet PU MVA PFNo Pileup (Charge Hadron Subtraction) Jet pT > 30 GeV |Jet eta| < 2.4 Clean Jets from leptonswith DeltaR<0.5 • MC is ID, Iso,and trigger efficiency corrected. • Official PU reweighting is used. 4

  5. Z Properties Njet≥0 Njet≥0 Z mass Muon Channel Elec Channel 5

  6. Z Properties Njet≥0 Njet≥0 Z phi Muon Channel Elec Channel 6

  7. Z Properties Njet≥0 Njet≥0 Z pT Muon Channel Elec Channel 7

  8. Z Properties Njet≥0 Njet≥0 Z Y Muon Channel Elec Channel 8

  9. Jet Multiplicity Central region (|jet η| <2.4 ) Muon Channel Elec Channel 9

  10. Leading Jet pT Njet≥1 Leading jet in Central (|jet η| <2.4 ) Muon Channel Elec Channel 10

  11. 2nd Leading Jet pT Njet≥1 SubLeading jet in Central (|jet η| <2.4 ) Muon Channel Elec Channel 11

  12. Unfolding Exclusive jet mult. (|jet η| <2.4 ) Muon Channel Elec Channel 12

  13. Unfolding Central region (|jet η| <2.4 ) Muon Channel Elec Channel 13

  14. First Look to 2D x-sec measurement

  15. Selections • Triggers HLT_Mu17_Mu8_v* HLT_Mu17_TkMu8_v* HLT_Ele17_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_Ele8_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL* • Muon • Electrons Muon matched trigger objects Muon pT > 20 GeV and |Muon eta| < 2.4 Opposite charge muons Tight Muon ID from Muon POG Loose PF base Combined relative ISO from Muon POG Z mass window of 71 to 111 GeV Elec matched trigger objects Elec pT > 20 GeV and |Elec eta| < 2.4 Opposite charge electrons Medium Electron ID EA Corrected PF ISO < 0.15 2012 EA’s used Z mass window of 71 to 111 GeV • Jets Loose Jet ID from POG Tight jet PU MVA PFNo Pileup (Charge Hadron Subtraction) Jet pT > 30 GeV |Jet eta| < 4.7 Clean Jets from leptonswith DeltaR<0.5 • MC is ID, Iso,and trigger efficiency corrected. • Official PU reweighting is used. 15

  16. Jet PT Muon Channel Elec Channel

  17. Jet eta Muon Channel Elec Channel

  18. 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.

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