We report the first measurement of the branching fraction f00 for Υ(4S)→B0B̄0. The data sample consists of 81.7fb-1 collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- storage ring. Using partial reconstruction of the decay B̄0→D*+ -ν̄ in which only the charged lepton and the soft pion from the decay D*+→D0π+ are reconstructed, we obtain f00=0.487±0.010(stat)±0.008(syst). Our result does not depend on the branching fractions of B̄0→D*+ -ν̄ and D*+→D0π+ decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Measurement of the branching fraction of Υ(4S)→B0B̄0. PHYSICAL REVIEW LETTERS, 95(4) [10.1103/PhysRevLett.95.042001].

Measurement of the branching fraction of Υ(4S)→B0B̄0

CARPINELLI, Massimo;
2005

Abstract

We report the first measurement of the branching fraction f00 for Υ(4S)→B0B̄0. The data sample consists of 81.7fb-1 collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- storage ring. Using partial reconstruction of the decay B̄0→D*+ -ν̄ in which only the charged lepton and the soft pion from the decay D*+→D0π+ are reconstructed, we obtain f00=0.487±0.010(stat)±0.008(syst). Our result does not depend on the branching fractions of B̄0→D*+ -ν̄ and D*+→D0π+ decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.
Articolo in rivista - Articolo scientifico
Charged particles; Particle detectors; Storage rings; BABAR detector; Branching fractions; Lepton; High energy physics;
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., et al. (2005). Measurement of the branching fraction of Υ(4S)→B0B̄0. PHYSICAL REVIEW LETTERS, 95(4) [10.1103/PhysRevLett.95.042001].
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