Measurement of the Branching Fraction of {upsilon}(4S){yields}B{sup 0}B{sup 0}
- Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
- IFAE, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona (Spain)
- Dipartimento di Fisica and INFN, Universita di Bari, I-70126 Bari (Italy)
- Institute of High Energy Physics, Beijing 100039 (China)
- Institute of Physics, University of Bergen, N-5007 Bergen (Norway); and others
We report the first measurement of the branching fraction f{sub 00} for {upsilon}(4S){yields}B{sup 0}B{sup 0}. The data sample consists of 81.7 fb{sup -1} collected at the {upsilon}(4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. Using partial reconstruction of the decay B{sup 0}{yields}D{sup *+}l{sup -}{nu}{sub l} in which only the charged lepton and the soft pion from the decay D{sup *+}{yields}D{sup 0}{pi}{sup +} are reconstructed, we obtain f{sub 00}=0.487{+-}0.010(stat){+-}0.008(syst). Our result does not depend on the branching fractions of B{sup 0}{yields}D{sup *+}l{sup -}{nu}{sub l} and D{sup *+}{yields}D{sup 0}{pi}{sup +} decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.
- OSTI ID:
- 20696470
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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