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7 TeV Dilepton Control Plots

This study presents plots of basic quantities related to ttH production in di-lepton channels using Monte Carlo simulations, specifically employing MC@NLO for ttbar and associated ntuples. We focused on events with two opposite-sign leptons and set various kinematic cuts, including minimum transverse momenta and specific HT thresholds. Observations indicate discrepancies between Monte Carlo predictions and actual data, particularly in inclusive jet/b-jet distributions. Future investigations will further examine the relationship between jet distributions and event characteristics in different channels.

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7 TeV Dilepton Control Plots

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  1. 7 TeVDilepton Control Plots Ricardo Gonçalo, RHUL

  2. 7 TeVDileptonttH • Made a few plots of basic quantities using the available Monte Carlo • Used MC@NLO for ttbar and Cécile’sntuples • Cuts: • ==2 opposite sign leptons • pTe> 25GeV, pTμ> 20GeV • pTjet> 25GeV • eμ-channel: • HT > 130GeV (using Cécile’s definition) • ee/μμ: • Mll> 15GeV && |Mll-MZ| < 10GeV • MET > 60GeV • Looked at various Njet / Nb-jet bins

  3. Cross sections on ttH wiki:https://twiki.cern.ch/twiki/bin/viewauth/AtlasProtected/TTH2bbWinter2013#MC11x(Corrections welcome!)

  4. 2 jets, 0 tags:MC overshoots data

  5. 2 jets, 1 tags:MC overshoots data

  6. 3 jets, 3 tags:Better, but MC still overshoots data

  7. ≥4 jets, ≥2 tags:Inclusive #jets distribution looks ≈ok!

  8. ≥4 jets, ≥4 tags:Run out of events

  9. Removed HT cut: ≥4jets ≥0 btag • ==2 opposite sign leptons • pTe> 25GeV, pTμ> 20GeV • pTjet> 25GeV • eμ-channel: • No HT cut • ee/μμ: • Mll> 15GeV && |Mll-MZ| < 10GeV • MET > 60GeV

  10. Removed HT cut: 3jets 2 btag HT cut has little effect since HT is already quite above the standard thresholds Left: HT>130 Right: HT>0

  11. The story so far… • Looked at eμ channel – completely dominated by ttbar • Exclusive jet/b-jet bins not well described by MC@NLO • To be expected if Njets distribution not well described • HT cut seems superfluous in the cases examined • Examine HT definition and try some other possibilities… next time

  12. μμ Channel • a

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