Measurements of Partial Branching Fractions for B→Xulν and Determination of |Vub|
Creators
- 1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
- 2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
- 3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
- 4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
- 5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)
Description
We present partial branching fractions for inclusive charmless semileptonic B decays B→Xulν, and the determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vub|. The analysis is based on a sample of 383x106 Υ(4S) decays into BB pairs collected with the BABAR detector at the SLAC PEP-II e+e- storage rings. We select events using the invariant mass MX of the hadronic system, the invariant mass squared, q2, of the lepton and neutrino pair, the kinematic variable P+, or one of their combinations. We then determine partial branching fractions in limited regions of phase space: ΔB=(1.18±0.09stat±0.07syst±0.01theor)x10-3 (MX<1.55 GeV/c2), ΔB=(0.95±0.10stat±0.08syst±0.01theor)x10-3 (P+<0.66 GeV/c), and ΔB=(0.81±0.08stat±0.07syst±0.02theor)x10-3 (MX<1.7 GeV/c2, q2>8 GeV2/c4). Corresponding values of |Vub| are extracted using several theoretical calculations
Additional details
Identifiers
- DOI
- 10.1103/PhysRevLett.100.171802;
- arXiv
- arXiv:0708.3702v2;
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 100
- Journal Issue
- 17
- Journal Page Range
- p. 171802-171802.7
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 40009730
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- B MESONS; BRANCHING RATIO; KOBAYASHI-MASKAWA MATRIX; MASS; NEUTRINOS; PAIR PRODUCTION; PHASE SPACE; SEMILEPTONIC DECAY; STANFORD LINEAR ACCELERATOR CENTER
- Descriptors DEC
- BEAUTY MESONS; BEAUTY PARTICLES; BOSONS; DECAY; DIMENSIONLESS NUMBERS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; INTERACTIONS; LEPTONS; MASSLESS PARTICLES; MATHEMATICAL SPACE; MATRICES; MESONS; NATIONAL ORGANIZATIONS; PARTICLE DECAY; PARTICLE PRODUCTION; PSEUDOSCALAR MESONS; SPACE; US DOE; US ERDA; US ORGANIZATIONS; WEAK PARTICLE DECAY
Optional Information
- Notes
- (c) 2008 The American Physical Society
- Collaborations
- BABAR Collaboration