My analysis on BToDlnu skims
Kenji Hamano
Last modified : Mar 31, 2005
Back to Home
Possible processes
rate process tag (p*l>1.5) rate
0.14% B+ -> D0bar l+ nu B- -> X l- nu 5.0%
0.40% B+ -> D*0bar l+ nu -> D0 l+ nu (1-2 gam) B- -> X l- nu 5.0%
0.006% B0 -> D- l+ nu B0b -> X l- nu 4.1%
0.013% B0 -> D*- l+ nu -> D0 l+ nu (pi-) B0b -> X l- nu 4.1%
0.006% B0 -> D*- l+ nu -> D- l+ nu (1-2 gam) B0b -> X l- nu 4.1%
0.006% B0 -> D- l+ nu B0 -> X l+ nu 0.9%
0.013% B0 -> D*- l+ nu -> D0 l+ nu (pi-) B0 -> X l+ nu 0.9%
0.006% B0 -> D*- l+ nu -> D- l+ nu (1-2 gam) B0 -> X l+ nu 0.9%
B0 -> D** l+ nu ->
B+ -> D0 rho+ -> K0b pi- l+ nu pi+ pi0 B- -> X l- nu
D+ -> (K- pi+) l+ nu D- -> X l- nu
D*+ -> D0 pi+ -> D0 mu+ nu D*- -> X l- nu
-> K- pi0 l+ nu pi+
D0 -> (K0b pi-) l+ nu D0b -> X l- nu
D*0 -> D0 (1-2 gam) -> K0b pi- l+ nu (1-2 gam) D*0b -> X l- nu
Combinatrial background ?
Mis identification of K, pi and lepton ?
Ntuple production
I applied tag side lepton mementum cut:
P*_lepton > 1.5 GeV
Location of ntuples at SLAC:
~khamano/releases/BToDlnu_16.0.3-physics-1/workdir/rootFiles
Quantities in the ntuple
DhadType: D* =>1, D =>0
DhadMode: Lund ID of Dhadron (D* or D)
D_plus => +411
D_minus => -411
D0 => +421
anti_D0 => -421
D_star_plus => +413
D_star_minus => -413
D_star0 => +423
anti_D_star0 => -423
DDecayMode: D0/D+ decay mode
1 => D0ToKpi
2 => D0ToK3pi
3 => D0ToKpipi0
4 => D0ToKspipi
5 => DchToKpipi
6 => DchToKspipi0
7 => DchToKspi
trueDlLep: Lepton from B=>1, otherwise=>0, for MC
trueDhad: for MC
trueDlnu: for MC
trueDhadlnu: for MC
DhadChrg: Charge of D hadron (D* or D)
DChrg: Charge of D
tagLeptChrg: Tag side (Dlnu) lepton charge
recoLeptChrg: Recoil side lepton (electron + muon) charge
recoLepType: Recoil lepton type: electron -> 1, muon -> 2
numRecoElec: number of non-overlap recoil electrons per candidate
numRecoMu: number of non-overlap recoil muons per candidate
numRecoLep: number of non-overlap recoil leptons per candidate
DhadMass: Dhadron (D* or D) mass
DMass: D mass
DhadMom: Dhadron (D* or D) momentum in CM
DMom: D momentum in CM
tagLeptMom: Tag side (Dlnu) lepton momentum in CM
recoLeptMom: Recoil lepton(electron+muon) momentum in CM
DLcosBY: cosTheta_ B-Dl
One BToDlnu candidate consists of one Dhadron and one Lepton.
Dhadron may be D* (D*+, D*-, D*0, or D*0bar) or D (D+, D-, D0, or D0bar).
DhadMode, DDecayMode, tagLepChrg, and recoLepChrg are useful to distinguish the types of processes.
DhadType, DhadChrg, DChrg should be consistent with DhadMode and DDecayMode.
D mass plots:
D0 mass mode-1 plot: OnPeak data vs MC + Off Peak
D0 mass mode-2 plot: OnPeak data vs MC + Off Peak
D0 mass mode-2 plot: OnPeak data vs MC (no Off Peak)
Dch mass mode-5 plot: OnPeak data vs MC + Off Peak
Dch mass mode-5 plot: OnPeak data vs MC (no Off Peak)
yellow = BpBm
magenta = B0B0bar
light blue = ccbar
green = uds
dark green = tautau
blue = OffPeak
D mass plots:
B+B- MC, D0 mass plots
B+B- MC, Dch mass plots
B0B0bar MC, D0 mass plots
B0B0bar MC, Dch mass plots
ccbar MC, D0 mass plots
ccbar MC, Dch mass plots
uds MC, D0 mass plots
uds MC, Dch mass plots
tautau MC, D0 mass plots
tautau MC, Dch mass plots
On Peak Data, D0 mass plots
On Peak Data, Dch mass plots
Off Peak Data, D0 mass plots
Off Peak Data, Dch mass plots
If I select only "trueDhad".
B+B- MC, D0 mass plots - trueDhad
B+B- MC, Dch mass plots - trueDhad
D0 mass plots:
Upper left: D0 -> Kpi
Upper right: D0 -> K3pi
Lower left: D0 -> Kpipi0
Lower right: D0 -> Kspipi
Dch mass plots:
Upper left: Dch -> Kpipi
Upper right: Dch -> Kspipi0
Lower left: Dch -> Kspi
Lower right: all modes
Tag side lepton and Dhadron momentum plots for Bch modes:
B+B- MC, lepton momentum plots
B+B- MC, Dhadron momentum plots
B0B0bar MC, lepton momentum plots
B0B0bar MC, Dhadron momentum plots
These looks almost same, so I selected only D Decay Mode 1
B+B- MC, lepton momentum plots (DMod 1)
B+B- MC, Dhadron momentum plots (DMod 1)
B0B0bar MC, lepton momentum plots (DMod 1)
B0B0bar MC, Dhadron momentum plots (DMod 1)
Now, total number of events are different.
And in tag side lepton momentum spectrum,
there is a excess of events at around 1.5 GeV in BpBm MC.
ccbar MC, lepton momentum plots (DMod 1)
ccbar MC, Dhadron momentum plots (DMod 1)
On Peak Data, lepton momentum plots (DMod 1)
On Peak Data, Dhadron momentum plots (DMod 1)
Off Peak Data, lepton momentum plots (DMod 1)
Off Peak Data, Dhadron momentum plots (DMod 1)
What's this peak at 5 GeV? Bhabha events?
Upper left: B+ -> D0bar l nu
(DhadMode==-421) && (tagLeptChrg>0) && (recoLeptChrg < 0)
Upper right: B- -> Do l nu
(DhadMode==421) && (tagLeptChrg< 0) && (recoLeptChrg>0)
Lower left: B+ -> D*0bar l nu
(DhadMode==-423) && (tagLeptChrg>0) && (recoLeptChrg< 0)
Lower right: B- -> D*0 l nu
(DhadMode==-423) && (tagLeptChrg< 0) && (recoLeptChrg>0)
Tag side lepton and Dhadron momentum plots for B0 modes:
B+B- MC, lepton momentum plots
B+B- MC, Dhadron momentum plots
B0B0bar MC, lepton momentum plots
B0B0bar MC, Dhadron momentum plots
Upper left: B0 -> D- l+ nu, reco l-
(DhadMode==-411) && (tagLeptChrg>0) && (recoLeptChrg<0)
Upper right: B0bar -> D+ l- nu, reco l+
(DhadMode==411) && (tagLeptChrg<0) && (recoLeptChrg>0)
Lower left: B0 -> D*- l+ nu, reco l-
(DhadMode==-413) && (tagLeptChrg>0) && (recoLeptChrg<0)
Lower right: B0bar -> D*+ l- nu, reco l+
(DhadMode==413) && (tagLeptChrg<0) && (recoLeptChrg>0)
Tag side lepton and Dhadron momentum plots for B0 oscillated modes:
B+B- MC, lepton momentum plots
B+B- MC, Dhadron momentum plots
B0B0bar MC, lepton momentum plots
B0B0bar MC, Dhadron momentum plots
Upper left: B0 -> D- l+ nu, reco l+
(DhadMode==-411) && (tagLeptChrg>0) && (recoLeptChrg>0)
Upper right: B0bar -> D+ l- nu, reco l-
(DhadMode==411) && (tagLeptChrg<0) && (recoLeptChrg<0)
Lower left: B0 -> D*- l+ nu, reco l+
(DhadMode==-413) && (tagLeptChrg>0) && (recoLeptChrg>0)
Lower right: B0bar -> D*+ l- nu, reco l-
(DhadMode==413) && (tagLeptChrg<0) && (recoLeptChrg<0)