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Jet Et Threshold Efficiency Study in HEPG Analysis

Partially solved MC issue. Analysis of Higgs events using jets. Leptons, photons need isolated electron, muon, or jetET. Study jet dynamics, triggers, efficiencies. Prepare for next meeting, compare results, explore full-simulation samples.

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Jet Et Threshold Efficiency Study in HEPG Analysis

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  1. Status: WW,ZZ->H->  Catalin, Kevin, Tony, Dovid

  2. Monte Carlo • Partially solved the MC issue: • Random gen. seed not used • Generate all MC in one job • OK – given that this is not full simulation • Real-simulation sample available? • Generated 50k events WW/ZZ ->Higgs • Last week – Dovid Skversky joined: • REU student – will work on these studies exclusively.

  3. HEPG-level plots Pt and  of the positive tau Higgs Mass = 130 GeV

  4. Leptons and Photons Require Isolated Electron Muon, or Photon

  5. JetET ET(j1)>35 GeV ET(j2)>20 GeV

  6. Jet Pseudorapidity

  7. Which jet Et? • Two kinds of jets in the atlfast ntuple: • JET(reconstructed jets) • JETB(reconstructed jets calibrated with atlfastB) Leading jet 2nd Leading jet

  8. JET vs JETB

  9. Erik’s parametrization • Considered all jets with Et<300 GeV and ||<2.8 • Example: 50 GeV threshold

  10. Efficiency vs Threshold • Thresholds from 30 GeV to 200 GeV • Exponential decrease • What about lepton triggers: • Only 2 studied: MU20 and EM25I • Efficiency: 26% • Overlap? • Only the 50 GeV jet thresh: • Overlap is 25% with lep trig. • Need more study

  11. Plans for the next meeting • Compare to Bruce results, for the same cuts. • Find out about full-simulation samples • Study the triggers in more detail. Also: • Include missing Et • ‘tau’ jets • Look at backgrounds, if available

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