Isolation Template Time Line

Ongoing and Next step

  • Definition of signal by scanning cut values on generator-level isolation (Yen-Jie)
  • Overall
    • Input information for the latest 357 MPA (default TIP and LIP cuts)
    • Pt binning (Darko)
    • Re-train fisher's discriminant for the following cuts and use the new MPAs (Yen-Jie)
      • Including track isolation in the fisher discriminant
        • no ID cuts
        • isLoose
        • Rong-Shyang's shower shape cuts (without isLoose and without any isolation cuts)
        • Rong-Shyang's shower shape cuts and isLoose
      • Excluding track isolation
  • ID
    • Compare Madgraph, no UE, ATLAS tune efficiency difference (Poter)
    • Importance of spikes (Yongsun, Yen-Jie)
  • Template and Purity
    • Compare random cone distributions with signal template in MC, derive isolation efficiency from data and also as a function of vertices (Yongsun)
    • Re-obtain purity with the latest fisher's discrimant and Rong-Shyang cuts (Rong-Shyang, Eiko?)
    • Work with the latest EG datasets (Rong-Shyang, Eiko?)
  • Systematic uncertainty
    • Find the jet fragmentation function that's not too crazy (current one has too low z and too much multiplicity) --> not sure the best way to do this? (Yun-Ju, Yen-Jie)
    • Try on ATLAS tune and no UE for signal template (Eiko)
    • Modify the background template with convolution of a mother template (Rong-Shyang)
    • Take the data to MC ratio of templates in min-bias data, and apply it to both signal and background templates (Eiko)
    • Reverse different ID variables for the background template (or combination of them) (Ming?)
  • Final x-section measurement and signal/background definition for the templates
    • A big script that links production of histograms, fitter, and efficiency (Eiko)

Completed tasks

  • ID
    • First optimization of preshower ID (Chia-Ming, Rong-Shyang, Poter, Zong-Kai, Kwan-Shin)
    • A set of cuts based on best significance (Rong-Shyang)
    • Fisher's discriminant after removing isolation cuts (Yen-Jie)
    • Efficiency x-check between MPA and RECO format (Poter, Eiko)
    • Efficiency with Rong-Shyang's cuts (Poter)
    • Study the efficiency difference of photon + jet hard scattering photons and dijet fragmentation photons for those all with gen isolation < xxxxx GeV (Eiko)
  • Template and Purity
    • Modified Laurent's code for MPA (Eiko)
    • Tried first version of purity tool (Eiko, Yun-Ju, Darko)
    • First study of correlation between isolation and shower shape variables (Darko)
    • Extended binned likelihood fitter (Rong-Shyang)
    • Normal binned likelihood fitter (Rong-Shyang)
    • Toy MC studies and comparison between likelihood fitter and TFractionFitter (Rong-Shyang)
    • chi2 fitter that takes into account uncertainty from template (Eiko)
    • 2-bin macro (that determines the cut value for 2-bin technique, and compute purity for the whole sample, and also the purity in the first and second bins) (Eiko)
    • Compare two-bin results with Rong-Shyang's fitter (Eiko)
  • Systematic uncertainty
    • Requested Photon+Jet MC samples with ATLAS-tune and no UE (Yun-Ju)
  • Final x-section
    • A complete work-flow (Rong-Shyang)

-- ShinShanYu - 28-Mar-2010

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Topic revision: r22 - 2010-05-19 - ShinShanYu
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