Measurement of the Branching Fraction of e⁺e^- --> B0B0bar at the Upsilon(4S) Resonance

2004/08/10 by The BABAR Collaboration, B. Aubert, Aubert, B.
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0408022

Latex, 18 pages, 7 figures, submitted to ICHEP 2004, Beijing, China

arxiv created 2004/08/10 · arxiv updated 2009/12/01

Abstract

We report a measurement of the branching fraction e⁺e^- --> B0B0bar with a data sample of 81.7 fb^-1 collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e⁺e^- storage ring. Using partial reconstruction of the decay B0bar --> D^*+ ℓ^- ν_ℓ we obtain a preliminary result of f00 = 0.486 +- 0.010(stat.) +- 0.009(sys.). Our result does not depend on branching fractions of the B0bar and the D^*+ decay chains, on the simulated reconstruction efficiency, on the ratio of the charged and neutral B meson lifetimes, nor on assumption of isospin symmetry. This measurement is important for normalizing many B decay branching fractions, and contributes to our understanding of isospin violation in the Upsilon(4S) system.

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