Description of BchToD0KAll and BchToD0KstarAll
skims
Last update: Oct 31, 2005 -- V. Azzolini For
R18
Last update: Feb 9, 2005 -- Stephen Schrenk For
R16
Last update: Sep 15 -- Wouter Verkerke
This web page documents the BchToD0KAll and BchToD0KstarAll
skims for the CM2 skim production. This pages describes the composition
of the skims in terms of tagsbits and
SimpleComposition/CompositionSequences lists and cuts and gives an
estimate of the selection efficiency and selection rate on various data
and MC samples
Description of skims and composition in terms of tag bits
Skim BchToD0KAll contains a large number of B+/- -->
D(*)0(bar)K+/- decays with D0 decaying into the 'mainstream' decay
modes as well as a variety of rare CP-odd and CP-even eigenstate. The
D*0 is reconstructed in both the D*0 --> D0 pi0 and D*0 --> D0
gamma modes. This skim includes doubly Cabibbo suppressed decays (B-
--> D(*)0bar K-). No PID cuts are applied to the bachelor kaon for
the D0 CP eigenstate decays to facilitate the measurement of BF(B- to
D0CP K-)/BF(B- to D0CP pi-). The D0 mass window is 70 MeV, except for
the D0->KsPiPi and D0->KsPiPiPi0 channels, which is 40 MeV. For
R18
new tag bits have been added specifically for D0->multibody (Dalitz)
decays, used for the D0(Dalitz)K gamma analysis. In this case,
the D0 mass window for all channels is 70 MeV.
The skim is defined as the 'or' of the following tag bits:
- BchToD0K
- BchToD0CPEvenK
- BchToD0CPOddK
- BchToD0barK
- BchToDstar0KLoose
- BchToDstar0CPEvenKLoose
- BchToDstar0CPOddKLoose
- BchToDstar0barKLoose
- BchToD0DalitzK
- BchToDstar0DalitzKLoose
These tag bits are created by TagFromList from the following
lists
- BchToD0KDefault (B- -> D0 K- )
- BchToD0CPEvenKDefault (B- -> D0(CPeven) K- (pi-))
- BchToD0CPOddKDefault (B- -> D0(CPodd) K- (pi-))
- BchToD0barKDefault (B- -> D0bar K- )
- BchToDstar0KLoose (B- -> D*0 K- )
- BchToDstar0CPEvenKLoose (B- -> D*0(CPeven) K- (pi-))
- BchToDstar0CPOddKLoose (B- -> D*0(CPodd) K- (pi-))
- BchToDstar0barKLoose (B- -> D0bar K- )
- BchToD0DalitzKDefault (B- --> D0(Dalitz) K- )
- BchToDstar0DalitzKLoose (B- --> D*0(Dalitz) K- )
which are also persisted in the skim. The definition of the skim and
the lists of candidates that are persisted are specified in FilterTools/BchToD0KAll.tcl
Skim BchToD0KstarAll contains a large number of B+/-
--> D(*)0(bar)K*+/-
decays with D0 decaying into the 'mainstream' decay modes as well as a
variety
of rare CP-odd and CP-even eigenstate decays. The D*0 is reconstructed
in
both the D*0 --> D0 pi0 and D*0 --> D0 gamma modes. The K*+/- is
reconstructed
in the modes K*+/- --> K*+/- pi0 and K*+/- --> KS pi+/-. This
skim
includes doubly Cabibbo suppressed decays (B- --> D(*)0bar K-). The
D0 mass window is 70 MeV, except for the D0->KsPiPi and
D0->KsPiPiPi0 channels, which is 40 MeV.
For R18
new tag bits have been added specifically for D0->multibody (Dalitz)
decays, used for the D0(Dalitz)K gamma analysis. In this case,
the D0
mass window for all channels is 70 MeV.
The skim is defined as the 'or' of the following tag bits:
- BchToD0KstarLoose
- BchToD0CPEvenKstarLoose
- BchToD0CPOddKstarLoose
- BchToD0barKstarLoose
- BchToDstar0KstarLoose
- BchToDstar0CPEvenKstarLoose
- BchToDstar0CPOddKstarLoose
- BchToDstar0barKstarLoose
- BchToD0DalitzKstarLoose
- BchToDstar0DalitzKstarLoose
These tag bits are created by TagFromList from the following
lists
- BchToD0KstarLoose (B- -> D0 K*- )
- BchToD0CPEvenKstarLoose (B- -> D0(CPeven) K*- )
- BchToD0CPOddKstarLoose (B- -> D0(CPodd) K*- )
- BchToD0barKstarLoose (B- -> D0bar K*- )
- BchToDstar0KstarLoose (B- -> D*0 K*- )
- BchToDstar0CPEvenKstarLoose (B- -> D*0(CPeven) K*- )
- BchToDstar0CPOddKstarLoose (B- -> D*0(CPodd) K*- )
- BchToDstar0barKstarLoose (B- -> D*0bar K*- )
- BchToD0DalitzKstarLoose (B- --> D0(Dalitz) K*- )
- BchToDstar0DalitzKstarLoose (B- --> D*0(Dalitz) K*- )
which are also persisted in the skim. The definition of the skim and
the lists of candidates that are persisted are specified in FilterTools/BchToD0KstarAll.tcl
All tag bits are defined in EventTagTools/TagProdCreateSequence.tcl
Description of tag bits in terms of CompositionSequences lists and
cuts
SMS->LH notapion
List Composistion
- BchToD0K = D0HardSemiLoose +
KMicroNotPion
GoodTracksVeryLoose (Oct 2004)
- BchToD0CPEvenK = D0CPEvenHardSemiLoose + GoodTracksVeryLoose
- BchToD0CPOddK = D0CPEvenHardSemiLoose + GoodTracksVeryLoose
- BchToD0barK = D0HardSemiLoose + KMicroNotPion
- BchToDstar0K = D0star0HardLooseSemiLoose + KMicroNotPion
- BchToDstar0CPEvenK = D0star0CPEvenHardLooseSemiLoose +
GoodTracksVeryLoose
- BchToDstar0CPOddK = D0star0CPOddHardLooseSemiLoose +
GoodTracksVeryLoose
- BchToDstar0barK = D0star0HardLooseSemiLoose + KMicroNotPion
- BchToD0Kstar = D0HardSemiLoose + KStarChrgSkimLoose
- BchToD0CPEvenKstar = D0CPEvenHardSemiLoose +
KStarChrgSkimLoose
- BchToD0CPOddKstar = D0CPOddHardSemiLoose +
KStarChrgSkimLoose
- BchToD0barKstar = D0HardSemiLoose + KStarChrgSkimLoose
- BchToDstar0Kstar = Dstar0HardLooseSemiLoose +
KStarChrgSkimLoose
- BchToDstar0CPEvenKstar = Dstar0CPEvenHardLooseSemiLoose +
KStarChrgSkimLoose
- BchToDstar0CPOddKstar = Dstar0CPOddHardLooseSemiLoose +
KStarChrgSkimLoose
- BchToDstar0barKstar = Dstar0HardLooseSemiLoose +
KStarChrgSkimLoose
- BchToD0DalitzKDefault = D0DalitzHardSemiLoose +
GoodTracksVeryLoose
- BchToDstar0DalitzKLoose = Dstar0DalitzHardSemiLoose +
GoodTracksVeryLoose
- BchToD0DalitzKstarLoose = D0DalitzHardSemiLoose +
KstarChrgSemiLoosePID
- BchToDstar0DalitzKstarLoose = Dstar0DalitzHardSemiLoose +
KstarChrgSemiLoosePID
List of D0 decays included
- Tree Level
- D0 --> K pi (70 MeV)
- D0 --> K pi pi0 (70 MeV)
- D0 --> K 3 pi (70 MeV)
- D0 --> KS pi pi (40 MeV)
- D0 --> KS pi pi pi0 (40 MeV)
- CP Even
- D0 --> Pi Pi (90 MeV)
- D0 --> K K (90 MeV/no PID)
- D0 --> Ks Ks (90 MeV)
- D0 --> Phi Eta Default (90 MeV)
- D0 --> Rho0 Eta Default (90 MeV)
- D0 --> Pi0 Pi0 Default (90 MeV)
- D0 --> Rho0 Pi0 Default (90 MeV)
- D0 --> Phi Pi0 Default (90 MeV)
- CP odd
- D0 --> Ks Pi0 (90 MeV)
- D0 --> Ks Eta (90 MeV)
- D0 --> Ks Phi
- D0 --> Ks EtaP (90 MeV)
- D0 --> Ks Omega
- D0 --> Ks Rho0
- Dalitz
- D0 --> Ks pi pi (70 MeV)
- D0 --> Ks pi pi pi0 (70 MeV)
- D0 --> KKKs (70 MeV)
- D0 --> pi pi pi0 (70 MeV)
Summary of applied cuts [changes w.r.t last BReco skim]
- m(D0) window: see above
- deltaM(D*0 --> D0 pi0) = 0.13 - 0.17 GeV
- deltaM(D*0 --> D0 gamma) = 0.08 - 0.18 GeV [WIDENED from
0.13-0.17 GeV ]
- m(K*+/-) window of 125 MeV [WIDENED from 75 MeV]
- deltaE window of 0.3 GeV
- mES: 5.15 - 5.35 GeV
Skim Efficiency estimate
To validate the skims we have done studies over the efficiency
selection
rate results at http://ific.uv.es/~babar/TagBit_test.html
For the test, we run over 10000 events from
AllEvents-Run4-OnPeak-R18.tcl
working with release 18.3.1b.
The skim rate is calculated over the total events 10000. The number of
hadronic
events passing FilterBGFMultiHadron is 2912 events.
Table 1 shows the skim rate for the test of the new tag bits, where
new,
old and all (new + old).
Only new tag bits are tested in Table 2, where the rate for all the
channels
is shown.
We made a detailed study of the skim rate for D0->kspipipi0, for
each
considered B decay.