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Update on Z+jets Cross Section & First Look at Z+Jets Double Differential Cross Sections at 8TeV

This study provides insights into Z+jets cross section and double differential cross sections at 8 TeV using datasets from 2012. The analysis includes muon and electron channels, jet properties, and unfolding techniques. The study compares results with previous analyses, focusing on jet distributions and unfolding procedures.

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Update on Z+jets Cross Section & First Look at Z+Jets Double Differential Cross Sections 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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