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Status of e μ low-p T trileptons

Status of e μ low-p T trileptons. Melisa Rossi Udine University. Outline . Data and MC Lepton Selection First Step: goodness of our tools Cross check with John’s Dielectron Control Regions Z window Outside Z window Conclusions - Next. Data and MC. Data

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Status of e μ low-p T trileptons

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  1. Status of eμ low-pT trileptons Melisa Rossi Udine University SUSY meeting

  2. Outline • Data and MC • Lepton Selection • First Step: goodness of our tools • Cross check with John’s Dielectron Control Regions • Z window • Outside Z window • Conclusions - Next SUSY meeting

  3. Data and MC • Data • SUSY dilepton dataset edil0d • Good run list v7 no silicon • 346 pb-1 up to August 2004 • 224pb-1 up to Februaty 2004 • DIELECTRON_CENTRAL_4 (CES2/3) • trigger efficiency from CDF7095 • MC • DY sexo8t (Z ll, Inv mass>5GeV/c2) • K-factor = 1.34 (John’s measurement) SUSY meeting

  4. Lepton Selection ET≥ 4 GeV Fid 1 |Z0| ≤60cm Had/Em ≤ 0.055+0.00045Eem E/p ≤ 2 or pT>50 GeV/c Lshr ≤ 0.2 Χ2strip ≤ 10 -3cm ≤ QΔX ≤ 1.5 cm |ΔZ| ≤ 3 cm NCotAx(5)≥3, NCotSt(5) ≥2 IsoFraction ≤ 0.1 • ID CEM selection • Remove conversions • Sxy<0.2, |Δcotθ|<0.04 • Dilepton selection • 1st electron ET>10 GeV • 2nd electron ET>5 GeV • ΔR>0.4 between electrons and electron-jet • ID Scale Factors • SF ET CDF note • 1.00 4-8GeV 7379 • 1.03 8-20GeV 7233 • 0.996 >20GeV 7309 SUSY meeting

  5. Dilepton Control Regions • CR1: Z window • 76 ≤ Mee≤ 106 GeV/c2 • CR2 : outside Z (diluted signal box) • MET>15 GeV • 15 < Mee< 76 and Mee> 106 GeV/c2 SUSY meeting

  6. CR1: Z window for 224pb-1 • ~35% difference with John • Χ2stripProblem CDF7309 SUSY meeting

  7. CR1: Z window for 224pb-1 Removing Χ2stripcut, ~15% difference with John SUSY meeting

  8. CR1: Z window for 224pb-1 SUSY meeting

  9. CR2: outside Z for 224pb-1 Removing Χ2stripcut, ~15% difference with John SUSY meeting

  10. CR2: outside Z for 224pb-1 SUSY meeting

  11. Mee spectrum for 224pb-1 SUSY meeting

  12. CR1-CR2 for 346pb-1 SUSY meeting

  13. Mee spectrum for 346pb-1 SUSY meeting

  14. Conclusions and Next • Data and DY MC are consistent • Understand • Χ2strip variable • ~15% difference with John • Add all MC samples • Move to the eμ channel • Fake estimation • Much more ... SUSY meeting

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