1. HZZ4e Isolation Study plan for 2010.


  • Isolation variable and efficiency calculation algorithms on the market - what is currently used (HZZ4l, EGamma, Alexey, Alberto Graziano, M. LeBourgois, D. Evans)
    • parameters used in algorithms:
      • cone opening,
      • pT normalization, only pT sum,
      • usage of TRK, ECAL and HCAL (Jurrasic method)
      • random cone technique - module to be produced

March, April, May

  • Low Lumi (< 5 Z events ~ 0.1 pb-1)
    • random cone technique on 2009 data (and try on MC@7TeV) - (in)efficiency check using existing but modified Egamma code
    • commissioning of isolation variables with QCD MinBias data (all charged tracks) - iterative process

May, June

  • As soon as we get some electrons from Tag and Probe Zs:
    • commissioning of isolation variables on electrons (could be different from charged track commissioning because of e.g. material budget)
    • propagation of isolation efficiencies from Z to ZZ (even if there is no ZZ events)
    • producing "unreasonable" limits on H->ZZ->4e (could be published by the end of the year - 100 pb-1)

By the end of the year (100 pb-1)

  • Deducing isolation efficiencies from Zbb, ttbar events
    • tagging , as example, on Z and b, then probing on other b to check differencies between fake electrons and electrons coming from Z.
    • Isolation vs. pT control of fake electron isolation

2. Important talks, papers, software ...

-- RokoPlestina - 11-Mar-2010

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