Tighter mu selection                                                                        Kenji Hamano

Last modified : Oct 04, 2005                                              Back to Home Back to privious page

The following lepton selectors were used in BToDlnu skims
   Electron - PidLHElectron
   Muon - muMicroTight
But there are many miss ID of leptons
I applied PidLHElectron and muNNTight

Run3 was used. MC luminosity is 30 fb-1.
Bhabha veto is applied.
Tighter K selection is applied.

For example in 50000 events of BpBm MC and B0B0bar MC
BpBmoriginalmuNNTight
electron355336 (49.7 %)355334
muon295552 (41.4 %)295552
pi51840 (7.26 %)51838
kaon10593 (1.84 %)10593
proton1035 (0.14 %)1035
total714356714352
B0B0baroriginalmuNNTight
electron350785 (50.0 %)350790
muon284699 (40.6 %)284699
pi59160 (8.4 %)59160
kaon5775 (0.82 %)5775
proton909 (0.13 %)909
total701328701333


There is almost no change


D0 mass
Dch mass


A. D0Kpi

D mass plots:
D0 mass (D0->Kpi) : MC components
nDl plots:
nDl (D0Kpi)

Fractional uncertainty of signal
Original
   nSig = 124441, nBkg = 516098, Delta_S/S = 0.006431
muNNTight selector
   nSig = 124449, nBkg = 516086, Delta_S/S = 0.006431
muNNTightAddLep
PeakSidebandPeakSideband
Bp->Dlnu173286665553241
Bp->D*lnu49162190715604618
Bp->D0**lnu458191527
Bp->D1**lnu3236116107044
Bp->D1H**lnu20346666526
Bp->D2**lnu12195540522
Bp->DPilnu20097268426
Bp->D*Pilnu14175347524
B0->D*lnu33161132110936469
B0->D0**lnu9063330212
B0->D1**lnu3645146120434
B0->D1H**lnu23169578335
B0->D2**lnu18955967618
B0->DPilnu4070192151774
B0->D*Pilnu15934458418
signal total1244494844406101668
non-B2454272197316076256440
lepton mis ID251291788493386377
lepton not direct from B66262447572646416812
lepton and D not from same B1792661575425278146207
wrong D decay mode1210
Pi miss ID0000
K pi not from same D1200
background total516086439918149346125836
Delta_S/S0.0064310.010732



B. DchKpipi

D mass plots:
Dch mass (Dch->Kpipi) : MC components
nDl plots:
nDl (DchKpipi)

Fractional uncertainty of signal
Original
   nSig = 81369, nBkg = 1291929, Delta_S/S = 0.014402
muNNTight selector
   nSig = 76842, nBkg = 1296450, Delta_S/S = 0.015250
muNNTightAddLep
PeakSidebandPeakSideband
Bp->D0**lnu15697857219
Bp->D1**lnu14637044923
Bp->D1H**lnu8523827511
Bp->D2**lnu23229975134
Bp->DPilnu65913052238106
Bp->D*Pilnu605182104
B0->Dlnu30679139410134435
B0->D*lnu2607512448647389
B0->D0**lnu746322339
B0->D1**lnu6993523113
B0->D1H**lnu476211634
B0->D2**lnu11703938511
B0->DPilnu3310175116163
B0->D*Pilnu28512775
signal total768423560255261126
non-B4049043848209515491674
lepton mis ID71120646672363021152
lepton not direct from B183591625788509855119
lepton and D not from same B632311612942158883153318
wrong D decay mode3353218484
Pi miss ID0000
K pi not from same D4189428010391113
background total12964501232688341368322460
Delta_S/S0.0152500.023729



Coclusion

1. Using muNNTight is meaningless.
2. Does not require additional lepton (lepton tag).