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Effective Criteria for Selecting Control Photons in QCD Background Modeling

This study investigates the effectiveness of the criteria used to select control photons, particularly in the context of QCD samples that can model backgrounds in events lacking true missing transverse energy (MET). Focusing on photon definitions, the analysis examines signal and control photon categories driven by specific criteria. It explores how cuts on photon objects affect sample population and assesses the ability to collect QCD events. Additionally, the study addresses the implications of requiring certain trigger conditions and the importance of cross-sections scaling for accurate modeling.

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Effective Criteria for Selecting Control Photons in QCD Background Modeling

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  1. background studies for GMSB Andrea Bangert Santa Cruz Institute for Particle Physics May 6th, 2010

  2. object definitions • all photons: • pT > 20 GeV • |eta| < 2.5 • signal photons: “gammas” • isEM::TightPhoton == 0 • Control sample photons: “QCD” • pass loose EM but not tight isEM criteria • (isEM::LoosePhoton == 0) && (isEM::TightPhoton != 0) • question: how effective is this criteria for selecting “control” photons?

  3. samples • two signal photons: • “gamma-gamma” • one signal photon, one “control” photon: • “gamma-QCD” • two “control” photons: • “QCD” • goal: collect a “QCD sample” which we can use to model the background due to events without true MET • question: will “QCD” events be in the event stream?

  4. estimates • only cuts on photon objects have been made • two photon objects were required • no cuts were made on MET or HT • need to require g20_loose or 2g10_loose trigger to fire. • will this collect “QCD” events? • need to know how cut on HT affects sample populations. • need to use cross sections, scale to L = 1 pb-1

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