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Semileptonic events 1 lepton from W p T gen >10 GeV , | h |<2.4

Semileptonic events 1 lepton from W p T gen >10 GeV , | h |<2.4 1 lepton p T >20 GeV,| h |<2.0 At least 2 jets (ET>20,| h |<2.4). Dileptonic events 2 leptons from W p T >10 GeV | h |<2.4 2 leptons p T >20 GeV, p T >15 GeV | h |<2.0, opposite charge

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Semileptonic events 1 lepton from W p T gen >10 GeV , | h |<2.4

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  1. Semileptonic events • 1 lepton from W • pTgen>10 GeV , |h|<2.4 • 1 lepton pT>20 GeV,|h|<2.0 • At least 2 jets (ET>20,|h|<2.4) • Dileptonic events • 2 leptons from W • pT>10 GeV |h|<2.4 • 2 leptons pT>20 GeV, pT>15 GeV |h|<2.0, opposite charge • At least 2 jets (ET>20,|h|<2.4) Generator cuts Off-line selection efficiencies reported etrig based on MC information etrig/off relative to the offline selection Used sample: CSA07 Chowder All Events CMSSW 167 (1652813 TTBAR)

  2. Off-line based trigger efficiencies vs h and pT tt->mnbjjb HLT1MuonNonIso tt->enbjjb HLT1ElectronRelaxed tt->mnbmnb HLT2MuonNonIso tt->enbenb HLT2ElectronRelaxed

  3. Semileptonic events • 1 lepton from W • pTgen>10 GeV , |h|<2.4 • 1 lepton pT>20 GeV,|h|<2.0, • isolated • At least 2 jets (ET>20,|h|<2.4) • Dileptonic events • 2 leptons from W • pT>10 GeV |h|<2.4 • 2 leptons pT>20 GeV, |h|<2.0, opposite charge, isolated • At least 2 jets (ET>20,|h|<2.4) Generator cuts Off-line selection Used sample: CSA07 Chowder All Events CMSSW 167 ( 619306 TTBAR) • isolation cuts Muons TrackIso<3 , CaloIso<5 Track isolation (POG)  SumpT of tracks in dR=0.3 Calo Isolation (POG)  Sum of energy deposits in HCal +ECal +HO in dR=0.3 Electrons TrackIso<3 , CaloIso<6 Track isolation (TQAF)  SumpT of tracks in dR=0.3 – pT of electron track Calo isolation (TQAF)  SumET of calotowers in dR=0.3 – electron. caloEnergy() Quality cuts HOverE<0.05 , 0.8<EOverP<3

  4. tt->enbjjb HLT1ElectronRelaxed New selection with Isolation cuts

  5. Semileptonic events • 1 lepton from W • pTgen>10 GeV , |h|<2.4 • 1 lepton pT>20 GeV,|h|<2.0, • isolated • At least 2 jets (ETRaw>13,|h|<2.4) • Dileptonic events • 2 leptons from W • pT>10 GeV |h|<2.4 • 2 leptons pT>20 GeV, |h|<2.0, opposite charge, isolated • At least 2 jets (ET>13,|h|<2.4) Generator cuts Off-line selection Used sample: RelValTTbar CMSSW 183 ( 25100 events • isolation cuts Muons TrackIso<3 , CaloIso<5 Track isolation (POG)  SumpT of tracks in dR=0.3 Calo Isolation (POG)  Sum of energy deposits in HCal +ECal +HO in dR=0.3 Electrons TrackIso<3 , CaloIso<6 Track isolation  SumpT of tracks in dR=0.3 – pT of electron track Calo isolation  SumET of calotowers in dR=0.3 – electron. caloEnergy() Quality cuts HOverE<0.05 , 0.8<EOverP<3

  6. RelValTTbar 1_8_3 25100 events

  7. New selection requiring isolated leptons

  8. a<0.15  99.6% a<0.15  99.6%

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