First Measurement of the Branching Fraction of e^+e^- --> B0B0bar

Details First Measurement of the Branching Fraction of e^+e^- --> B0B0bar First Measurement of the Branching Fraction of e^+e^- --> B0B0bar

2004-11-08

arxiv.org/abs/hep-ex/0411029v1

Int.J.Mod.Phys.A20:3605-3608,2005

Physics

High Energy Physics

High Energy Physics - Experiment

Latex, 5 pages, 2 figures, proceedings to the DPF 2004, 26 August-31 August 2004, Riverside, CA, USA

Scientific paper

10.1142/S0217751X05027084

We report the first measurement of the absolute branching fraction e^+e^- --> B0B0bar at the Upsilon(4S) resonance using data collected with the BABAR detector at the PEP-II asymmetric-energy e^+e^- storage ring. The analysis is performed with partial reconstruction of the decay B0bar --> D^{*+}\ell^{-} \bar{\nu}_{\ell}$, where the presence of a signal decay is determined using only the lepton and the soft pion from the D^{*} decay. By reconstructing events with one or two signal decays we obtain a preliminary result of e^+e^- --> B0B0bar = 0.486 \pm 0.010(stat.) \pm 0.009(sys.)$. Our result does not depend on branching fractions of the B0bar and the D^{*+} decay chains, on the individual simulated reconstruction efficiencies, on the ratio of the charged and neutral B meson lifetimes, or on the assumption of isospin symmetry.

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