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7 TeV Dilepton Control Plots. Ricardo Gonçalo , RHUL. 7 TeV Dilepton ttH. Made a few plots of basic quantities using the available Monte Carlo Used [email protected] for ttbar and C écile’s ntuples Cuts: ==2 opposite sign leptons p T e > 25GeV, p T μ > 20GeV p T jet > 25GeV e μ -channel:

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7 tev dilepton control plots

7 TeVDilepton Control Plots

Ricardo Gonçalo, RHUL


7 tev dilepton tth
7 TeVDileptonttH

  • Made a few plots of basic quantities using the available Monte Carlo

  • 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


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


2 jets 0 tags mc overshoots data
2 jets, 0 tags:MC overshoots data


2 jets 1 tags mc overshoots data
2 jets, 1 tags:MC overshoots data


3 jets 3 tags better but mc still overshoots data
3 jets, 3 tags:Better, but MC still overshoots data


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


4 jets 4 tags run out of events
≥4 jets, ≥4 tags:Run out of events


Removed ht cut 4jets 0 btag
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


Removed ht cut 3jets 2 btag
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


The story so far
The story so far…

  • Looked at eμ channel – completely dominated by ttbar

  • Exclusive jet/b-jet bins not well described by [email protected]

    • 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


Channel
μμ Channel

  • a


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