first look into sbottom and gluino reconstruction

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First look into sbottom and gluino reconstruction. Massimiliano Chiorboli University and INFN Catania. m (GeV). m (GeV). 299.2. 273.4. 275.0. 94.5. 309.3. 95.0. > 300. 44.5. SUGRA parameters. p. b. b. p. Decay chain and event topology. Event final state: - PowerPoint PPT Presentation

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  • First look into sbottom and gluino reconstructionMassimiliano ChiorboliUniversity and INFN Catania

    Massimiliano Chiorboli

  • SUGRA parameters

    m0200 GeVm1/2100 GeVtan b2A00sign m-

    Massimiliano Chiorboli

  • Decay chainand event topologyEvent final state: 2 high pt isolated leptons OS 2 high pt b jets missing Et

    Massimiliano Chiorboli

  • Events productionSPYTHIA (PYTHIA 6.136)CMSJET 4.703

    3 fb-1

    Massimiliano Chiorboli

  • Events selectionat least 2 isolated leptons with pt>15 GeV and |h|15 GeV and |h|
  • invariant mass of e+e- and m+m-due to kinematics, the distribution shows an edge

    Massimiliano Chiorboli

  • Subtracting invariant mass of OSOF pairs eliminate SM and combinatorial bkg

    Massimiliano Chiorboli

  • estimation

    Massimiliano Chiorboli

  • Sbottom reconstruction

    Massimiliano Chiorboli

  • Sbottom reconstruction (II)reconstructed neutralino combined with the most energetic b-jet, assuming Mc1 known

    Massimiliano Chiorboli

  • Sbottom reconstruction (III)Assuming M(c10) = 44.5 GeVAt the moment, no jet energy correction

    Massimiliano Chiorboli

  • Gluino reconstructioncombination of the reconstructed sbottom and a b-jet~ 10 % of the selected events have >2 b-jets

    the b-jet closest to the reconstructed sbottom is chosen

    Massimiliano Chiorboli

  • Gluino reconstruction (II)

    Massimiliano Chiorboli

  • Gluino reconstruction (III)

    Massimiliano Chiorboli

  • Gluino reconstruction (IV)Cut on this angle to select the b-jet coming from the gluino

    Massimiliano Chiorboli

  • Gluino reconstruction (V)

    Massimiliano Chiorboli

  • Sbottom and gluino after cuts (cos f > 0.8)

    Massimiliano Chiorboli

  • evaluation

    Massimiliano Chiorboli

  • evaluation (II)

    Massimiliano Chiorboli

  • Dependence from

    c10 mass assumed to be known

    Massimiliano Chiorboli

  • Results within 3 fb-1

    Massimiliano Chiorboli

  • Future plansScanning the mSUGRA parameters plane

    Including the jet energy correction

    Improving the cuts

    Studying this decay chain as a benchmark channel for the b-tagging

    Massimiliano Chiorboli

  • Gluino reconstruction

    Massimiliano Chiorboli

  • Sbottom reconstructionAssuming M(c10) = 44.5 GeVAt the moment, no jet energy correction

    Massimiliano Chiorboli