First Measurement of the Branching Fraction of e^+e^- to B0B0bar
- SLAC
We report the first measurement of the absolute branching fraction e{sup +}e{sup -} {yields} B{sup 0}{bar B}{sup 0} at the {Upsilon}(4S) resonance using data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. The analysis is performed with partial reconstruction of the decay {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {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{sup +}e{sup -} {yields} {bar B}{sup 0}{bar B}{sup 0} = 0.486 {+-} 0.010(stat.) {+-} 0.009(sys.). Our result does not depend on branching fractions of the {bar B}{sup 0} and the D*{sup +} 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.
- Research Organization:
- Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-76SF00515;
- OSTI ID:
- 839621
- Report Number(s):
- SLAC-PUB-10840
- Country of Publication:
- United States
- Language:
- English
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