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p p  Z  4 lepton Analysis. Bing Zhou. Single Resonant Observation and cross-section measurement. Preliminary studies done based on 7 TeV and 8 TeV (HCP dataset) Working group mailing list: atlas-phys- sm - zsr Analysis Twiki page created by Jianbei Liu

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Presentation Transcript
single resonant observation and cross section measurement
Single Resonant Observation and cross-section measurement
  • Preliminary studies done based on 7 TeV and 8 TeV (HCP dataset)
  • Working group mailing list: atlas-phys-sm-zsr
  • Analysis Twiki page created by Jianbei Liu
  • Supporting note in SVN by Alan Wilson:
  • svn+ssh://svn.cern.ch/reps/atlasusr/wilsona/SingleZ4l/SingleZ4lNote2012/trunk

Introduction

Z 4 lepton

analysis scope and mc modeling
Analysis Scope and MC modeling
  • Measurement of sZxBr (Z eeee,mmmm, eemm and mmee)
  • Weekly Analysis meeting chaired by Jianbei Liu
  • MC signal modeling and production:

-- Cross-section: MCFM and Powheg+pythia8

-- Event generations: Powheg, and Sherpa (x-check)

  • Proposed MC event production filter:
    • At least three leptons with pT>5 GeV, |eta| < 2.7
    • MZ1 > 10m GeV, MZ2 > 0.25 GeV; M4l > 40 GeV
    • 300k for four process above; and maybe additional 100k for process involving Z tautau
dataset and time table
Dataset and Time Table
  • 7 TeV data (4.8 fb-1)
  • 8 TeV data (full 2012 dataset ~24 fb-1) (now 19.7 fb-1 collected, 4 more weeks data taking)
  • Event selection cuts fixing by Nov. 30, 2012 (two weeks) using Powheg(7TeV) and Sherpa (8 TeV) MC for signal, and Z+jets (20M events)
  • Starting point: final HCP selection (same as Higgs to ZZ selection, but relax pT(m) and m34 cuts)
  • Data process (selection) by Dec. 30.
  • First complete analysis draft by Jan. 30.

Support Note Editor: Richard and Bing

  • Paper draft: Feb. 15 (need time for approval for Moriond) – Editor: Alan Wilson, Richard & Bing