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B d → J/  + K s reconstruction (d0root_xxx)

B d → J/  + K s reconstruction (d0root_xxx). I have used two kinds of mass constraints: VertexMassConstraint for Ks to form a composite track

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B d → J/  + K s reconstruction (d0root_xxx)

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  1. Bd → J/ + Ks reconstruction(d0root_xxx) • I have used two kinds of mass constraints: • VertexMassConstraint for Ks to form a composite track • MassConstraint1 in BphysicsAnalysis which now seems to be “problematic”. Phil/Brad corrected one bug (J/ mass changed after 1st mass constraint). • Data used are the old set1 to set10 of “AA”. Kin Yip March 27, 2003

  2. SMT hits1, kpT>0.5,2(K)10, BpT>3 GeV, 2(B) <25, PT(J/) > 4, 2.9< m < 3.3, 0.475<m(Ks)<0.5225, |dl/(K)|>3 Looser mass-constrained NB0 = 88 ± 28 ( GeV )

  3. One more cut: |B decay length| > 0.3 mm NB0 = 54 ± 15 mass-constrained ( GeV )

  4. Same but mass unconstrained NB0 = 60 ± 16 ( GeV )

  5. with J/ mass bug NB0 = 35 ± 15 ( GeV )

  6. B0 Lifetime (cm)

  7. Monte Carlo with J/ mass bug fixed

  8. Monte Carlo unconstrained + 3.09688 – di-_mass

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