Measurements of Partial Branching Fractions for B{yields}X{sub u}l{nu} and Determination of |V{sub ub}|
- Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
- Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
- Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
- University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
- Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)
We present partial branching fractions for inclusive charmless semileptonic B decays B{yields}X{sub u}l{nu}, and the determination of the Cabibbo-Kobayashi-Maskawa matrix element |V{sub ub}|. The analysis is based on a sample of 383x10{sup 6} {upsilon}(4S) decays into BB pairs collected with the BABAR detector at the SLAC PEP-II e{sup +}e{sup -} storage rings. We select events using the invariant mass M{sub X} of the hadronic system, the invariant mass squared, q{sup 2}, of the lepton and neutrino pair, the kinematic variable P{sub +}, or one of their combinations. We then determine partial branching fractions in limited regions of phase space: {delta}B=(1.18{+-}0.09{sub stat}{+-}0.07{sub syst}{+-}0.01{sub theor})x10{sup -3} (M{sub X}<1.55 GeV/c{sup 2}), {delta}B=(0.95{+-}0.10{sub stat}{+-}0.08{sub syst}{+-}0.01{sub theor})x10{sup -3} (P{sub +}<0.66 GeV/c), and {delta}B=(0.81{+-}0.08{sub stat}{+-}0.07{sub syst}{+-}0.02{sub theor})x10{sup -3} (M{sub X}<1.7 GeV/c{sup 2}, q{sup 2}>8 GeV{sup 2}/c{sup 4}). Corresponding values of |V{sub ub}| are extracted using several theoretical calculations.
- OSTI ID:
- 21128099
- Journal Information:
- Physical Review Letters, Vol. 100, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.100.171802; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). BABAR Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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