Tighter mu selection                                                                        Kenji Hamano

Last modified : Aug 23, 2005                                              Back to Home Back to privious page

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The following lepton selectors were used in BToDlnu skims
   Electron - PidLHElectron
   Muon - muMicroTight
But there are many miss ID of leptons
For example in BpBm AddLep MC
   electrons(ID=11, -11) 548850
   muons(13, -13) 519233
   pions(211, -211) 110790 (9.11 %)
   kaons(321, -321) 32546 (2.68 %)
   protons(2212, -2212) 4670 (0.38 %)

I applied PidLHElectron and muNNTight
   electrons 549471
   muons 485417
   pions 84434 (7.36 %)
   kaons 23939 (2.09 %)
   protons 3163 (0.28 %)


D mass plots from AddLepton subskims:
No tag-lepton lower momemtum cut. Higher momentum cut <2.7 GeV
Tight K selection is applied
D0 mass (D0->Kpi)
Dch mass (Dch->Kpipi)

Fractional uncertainty of signal

B0Kpi

Original
   nSig = 143944, nBkg = 180117, Delta_S/S = 3.955e-3
muNNTight selector
   nSig = 138452, nBkg = 159087, Delta_S/S = 3.940e-3
0.4 < P_lep
   nSig = 88921, nBkg = 98256, Delta_S/S = 4.865e-3

BchKpipi

Original
   nSig = 285180, nBkg = 311696, Delta_S/S = 2.709e-3
muNNTight selector
   nSig = 275795, nBkg = 280218, Delta_S/S = 2.704e-3
0.1 < P_lep
   nSig = 181421, nBkg = 187250, Delta_S/S = 3.347e-3
0.1 < P_lep
   nSig = 153743, nBkg = 158974, Delta_S/S = 3.637e-3

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