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VBF H- > ττ- > lept had Electron Channel Summary and Final Results

VBF H- > ττ- > lept had Electron Channel Summary and Final Results. Jaspreet Sidhu ATLAS Toronto meeting 30-08-05. Produced updated Full Simulation of H  ττ, τ  e  , τ  h , with good TRT( Transition Radiation Track) simulation Electron and τ Identification

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VBF H- > ττ- > lept had Electron Channel Summary and Final Results

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  1. VBF H->ττ->lept hadElectron ChannelSummary and Final Results Jaspreet Sidhu ATLAS Toronto meeting 30-08-05

  2. Produced updated Full Simulation of H  ττ, τ  e , τ h, with good TRT( Transition Radiation Track) simulation Electron and τ Identification Higgs Reconstruction Efficiency Summary

  3. Generation + Simulation – Release 10.0.1 – Rome layout, with TRT simulation Digitization + Reconstruction – Release 10.0.1 – Default reconstruction parameters • Electrons, tau’s…, jets – R=0.4 Cone algorithm for jets – AOD objects Data Set Pythia & Tauola Production H->ττ , VBF mode 10000 Events (after filtering) MH = 115GeV τ-> e , τ-> h (σ x BR) = 390 fb

  4. Electron Filter • Use Single High Pt Electron Filter • No Filter 688 electrons • Filter pt >15GeV || <2.7 452 electrons = 66% • 10000 VBF Higgs events (after filtering) • 10.0.1 release for simulation • 10.0.1 for digitization w/o pile-up

  5. Elec ID ( 3 Basic Cuts) cut 1: hasTrack() & pT >20GeV cut 2 : egamma object cut 3 : isEM ==0 (using all the flags including TRT) Stronger Elec ID cuts Isolation: Et cone<10GeV in R=0.45 && 0.8 < EoverP <1.4 Full simulation Elec ID

  6. Electron Reconstruction Efficiency

  7. Number of Electrons Basic Cut All Electrons Hard Elec Cuts isEM All flags

  8. Stronger Elec ID Cuts EtCone EoverP Dijet File Higgs Signal File

  9. Dijet Rejection

  10. Taujet Identification • Taujet is essentially a narrow jet in the detector • Taujet Id Cuts cut 1: abs(charge)==1 cut 2: NumTrack ==1 or 3 cut 3: likelihood >4 cut 4: pt >40 GeV

  11. Taujet Reconstruction Efficiency

  12. Higgs Reconstruction • Use Identified Electrons and Taujets and reconstruct the Invariant Mass of the Tau System • Use Collinear Approximation Using the missing transverse momentum and assuming Tau decay products are collinear with original Tau, solve 2 linear equations for missing neutrinos, can reconstruct the Tau’s and hence the Invariant mass of the whole system(Higgs Mass)

  13. Higgs Reconstruction • Reconstruct 833 events • Efficiency of Reconstruction ~ 21.8 % • Mean =110.1Gev • Sigma=11.9 Gev • With stronger Elec ID cuts efficiency drops to  = 18.0%

  14. Summary • Electron Identification Efficiency ( =70.9%) • With Harder Cuts ( =56.8%) • Dijet Rejection ( Can Reject 85.2% of electrons) • Tau Identification Efficiency ( =30.0%) • Higgs Reconstruction Efficiency ( =21.8%) • With Harder Elec Id Cuts ( =18.0%) • Next Step : Reconstruction in Release 10.0.4 • Trigger simulation

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