First Measurement of the Branching Fraction of e^+e^- to B0B0bar [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2004. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Additional Creators:
- Stanford Linear Accelerator Center, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
- Access Online:
- www.osti.gov
- Summary:
- We report the first measurement of the absolute branching fraction e⁺e⁻ → B°{bar B}° at the Υ(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 {bar B}° → D*⁺ℓ⁻{bar ν}{sub ℓ}, 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⁻ → {bar B}°{bar B}° = 0.486 ± 0.010(stat.) ± 0.009(sys.). Our result does not depend on branching fractions of the {bar B}° 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.
- Subject(s):
- Note:
- Published through SciTech Connect., 11/02/2004., "slac-pub-10840", and Godang, R.
- Type of Report and Period Covered Note:
- Topical;
- Funding Information:
- AC02-76SF00515
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