BToDlnu NAME BToDlnu SYNOPSIS The skim contains events with at least a B -> D l nu or a B -> D* l nu candidate. Reconstructed B decay modes: ============================ Neutral B -> Charged D e/mu (neutrino) Neutral B -> Charged D* e/mu (neutrino) Charged B -> Neutral D e/mu (neutrino) Charged B -> Neutral D* e/mu (neutrino) Reconstructed D* decay modes: ============================== Charged D* -> Neutral D Charged pi Charged D* -> Charged D Neutral pi Neutral D* -> Neutral D Neutral pi Reconstructed D decay modes: ============================ Neutral D -> Charged K Charged pi Neutral D -> Charged K Charged pi Neutral pi Neutral D -> Charged K + 3 Charged pi Neutral D -> K_short + 2 Charged pi (K_short -> 2 charged pi) Charged D -> Charged K + 2 Charged pi Charged D -> K_short Charged pi (K_short -> 2 charged pi) Event selection: ================ lepton momentum in CM frame greather than 0.8 GeV ------ electron : PidLHElectrons (likelihood selector) muon : NNTight (neural network tight) Neutral D candidates -------------------- D0 -> K pi : from the D0ToKPiLoose list. mass window centered ad the D0 mass +/- 60 Mev D0 -> K pi pi0 : from the D0ToKPiPi0Loose list. mass window centered ad the D0 mass +/- 100 Mev D0 -> K 3 pi : from the D0ToK3PiLoose list. mass window centered ad the D0 mass +/- 60 Mev D0 -> Ks 2 pi : from the D0ToKsPiPiLoose list. mass window centered ad the D0 mass +/- 60 Mev Charged D candidates -------------------- D+ -> K pi pi : from the DcToKPiPiLoose list mass window centered ad the D+ mass +/- 60 Mev D+ -> Ks pi : from the DcToKsPiLoose list mass window centered ad the D+ mass +/- 60 Mev Charged D* candidates --------------------- D* -> D0 charged pi : soft pion from GoodTracksVeryLoose 0.135 MeV < m(D*) - m(D0) < 0.175 soft pion momentum < 450 MeV D* -> charged D pi0 : soft pion from pi0SoftDefaultMass 0.140 MeV < m(D*) - m(D0) < 0.150 soft pion momentum < 450 MeV Neutral D* candidates --------------------- D* -> D0 pi0 : soft pion from pi0SoftDefaultMass 0.135 MeV < m(D*) - m(D0) < 0.175 soft pion momentum < 450 MeV For further details: CompositionSequences/CompBToDlnuProdSequence.tcl Event Rate selection rate: ========================== On Peak Off Peak Run1: 3.41 % | 1.6% Run2: 3.49 % | 1.7% Run3: 3.78 % | 1.9% Run4: 3.70 % | 1.9% Persisted Candidate lists: ========================== BToDlnuSkimmedList : contains all the B -> D (D*) l nu candidates without vertex fit. BToDstarlnuSkimmedList : contains only the B -> D* l nu candidates. With a complete set of constraints applied: 1) D, pi0, Ks masses constrained to the respective nominal values, 2) lepton and D* constrained to meet at a common point 3) pi0 and Ks production point constrained to the mother particle decay point 4) Ks decays product constrained to meet at a common point Vertex Fitter Algorithm: TreeFitter User Variables: =============== BToDlnuEventData: for each event 2 User variables are stored: 1) decayModes (16 bit wide bitmask) bit 0 B -> D0 (K pi ) l nu bit 1 B -> D0 (K 3 pi ) l nu bit 2 B -> D0 (K pi pi0) l nu bit 3 B -> D0 (Ks pi ) l nu bit 4 B -> D*0 (K pi ) l nu bit 5 B -> D*0 (K 3 pi ) l nu bit 6 B -> D*0 (K pi pi0) l nu bit 7 B -> D*0 (Ks pi ) l nu bit 8 B -> Dch (K 2 pi ) l nu bit 9 B -> Dch (Ks pi ) l nu bit 10 B -> D* ch ( D0-> K pi ) l nu bit 11 B -> D* ch ( D0-> K 3 pi ) l nu bit 12 B -> D* ch ( D0-> K pi pi0) l nu bit 13 B -> D* ch ( D0-> Ks 2 pi ) l nu bit 14 B -> D* ch ( Dch-> K pi pi) l nu bit 15 B -> D* ch ( Dch-> Ks pi ) l nu bit #n set if the event contains at least one candidate of the given type. 2) decayType (4 bit wide bitmask): bit 0 B -> D0 l nu bit 1 B -> Dch l nu bit 2 B -> D* ch l nu bit 3 B -> D*0 l nu bit #n set if the event contains at least one candidate of the given type. BToDlnuCandData: for each candidate in the BToDlnuSkimmedList the following variables are stored: 1) BDecayMode (16 bit wide bitmask) same semantic of the Event base decayModes 2) cosThetaBY (float): Angle of the B momentum with respect to the B visible momentum (i.e. charmed meson +lepton) in the Y4S rest frame. for each candidate in the BToDstarlnuSkimmedList the following user variables are stored: B_decay_mode bitmask: bit #0 set if Charged_B bit #1 set if beautiness == -1 (i.e. is set if the meson contains a b quark is not set if the meson contains a b_bar) bit #2 set if lepton charge < 0 bit #3 set if the D meson is neutral, bit #3,#4,#5 B_decay_mode & 0x70 == // Neutral D decay modes 0x10 // K_pi 0x20 // K_3pi 0x30 // K_pi_pi0 0x40 // KS_2pi // Charged D decay modes 0x50 // K_2pi 0x60 // KS_pi bit #6,#7 reserved for future use B_chi2_prob chi^2 probability of the whole B decay tree B_vtx_status convergence status of the whole B decay tree B_p4 momentum of the refitted B in lab. frame l_p4 momentum of the refitted lepton in lab. frame Dstar_p4 momentum of the refitted D* in lab. frame D_p4 momentum of the refitted D in lab. frame pis_p4 momentum of the refitted soft_pion in lab. frame Dstar_mass_raw D* mass as given by the raw sum of the reco p4 Dstar_mass D* mass as given by a fit with all constraints applied (except D* mass off course...) D_mass_raw D mass as given by the raw sum of the reco p4 D_mass D mass as obained by a fit with geometrical constraints and mass constraints for pi0/KS applied D_chi2_prob chi^2 probability of the D meson fit D_vtx_status convergence status of the D meson fit cos_theta_BY Angle of the B momentum with respect to the B visible momentum (i.e. charmed meson +lepton) in the Y4S rest frame. e_bitmask electron bitmask for the lepton mu_bitmask muon bitmask for the lepton K_bitmask kaon bitmask for the charged strange daughter of the charmed meson Further info: BToDlnuSkimmedList: UsrTools/UsrWriteBToDlnu.cc UsrTools/UsrWriteBToDlnu.hh BToDstarlnuSkimmedList: FilterTools/BToDstarlnuXFilter.hh FilterTools/BToDstarlnuXFilter.cc BAD note #537 Contact person: Eugenio (eugenio.paoloni@pi.infn.it)