Muon Fake Rates with baseline Susy selection from QCD

Summary page for Muon fake rates.

Cuts for fakerate determination

• no general event selection:
  • Dont' simulate single jet trigger by requiring at least one jet with uncorrected p_T > 30 GeV
  • Don't remove trigger bias by veto'ing all denominator and numerators near the leading jet (delat R cut)

• Denominator
  • Version-52

          if (!((cms2.mus_type().at(iMu)) & (1<<1)) ) return false; // global muon
          if (!((cms2.mus_type().at(iMu)) & (1<<2)) ) return false; // tracker muon
          if( pt < 10)  return false;
          if( fabs( eta ) > 2.4 ) return false;
          if( cms2.mus_gfit_chi2()[iMu]/cms2.mus_gfit_ndof()[iMu] > 20) return false;
          if (inv_mu_relsusy_iso(iMu) > 0.4 ) return false;
         if (fabs(cms2.mus_d0corr().at(iMu))   >= 0.02) return false;
          

This is the same denominator as in ttbar note, except:

• require tracker and global muon
• lower pT to 10GeV
• switch iso to be same as for electron fakes

• Numerator - GoodSusyMuonWithoutIsolation & PassSusyMuonIsolation

Samples for fake rate determination

• QCD pt 30 GeV .AND. QCD pt 80 GeV

Muon Fake rates

The high pT bin includes the overflow, i.e. it is actually 60-infinity.

Closure test: Wjets Same Sign

• emu Wjets madgraph.
• electron is trueElectronFromW .AND. full electron Id .AND. isolation .AND. pT > 10GeV

• Plots for pT, eta, and Njets:

• Numbers are event counts, no weights as all weights are the same for all events.
• Actual, predicted: 7 +- 2.65, 3.43451 (no error propagation yet because error is dominated by FR error)

Application to ttbar: Same Sign

• Numbers are weights, all weights are the same for all events. Weight per event is 0.43.
• look at mumu only.
• prediction comes from one numerator .AND. one (FO .AND. .NOT. numerator) times (FR/(1-FR))
• there are no charge fakes expected in mumu, and we check it via new WW/WO/OO classification.

loose cuts

• tcmet > 40GeV, Njet > 0.
• actual, prediction: 9.6, 15.52 [No errors yet]

tight cuts

• 80GeV tcmet, leading jet pT > 100GeV
• actual, prediction: 1.75, 2.44 [No errors yet]

Same Sign selection cuts

• 80GeV tcmet, Njet >2, Sumpt > 200GeV
• actual, prediction: 1.312, 1.03131 [No Errors yet]

-- SanjayPadhi - 23 Jul 2009