Published November 24, 2006
| Version v1
Journal article
Measurement of the B→πlν Branching Fraction and Determination of vertical bar Vub vertical bar with Tagged B Mesons
Creators
- 1. Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux (France)
- 2. Universitat de Barcelona, Facultat de Fisica Dept. ECM, E-08028 Barcelona (Spain)
- 3. Universita di Bari, Dipartimento di Fisica and INFN, I-70126 Bari (Italy)
- 4. Institute of High Energy Physics, Beijing 100039 (China)
- 5. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
Description
We report a measurement of the B→πlν branching fraction based on 211 fb-1 of data collected with the BABAR detector. We use samples of B0 and B+ mesons tagged by a second B meson reconstructed in a semileptonic or hadronic decay and combine the results assuming isospin symmetry to obtain B(B0→π-l+ν)=(1.33±0.17stat±0.11syst)x10-4. We determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub| by combining the partial branching fractions measured in ranges of the momentum transfer squared and theoretical calculations of the form factor. Using a recent lattice QCD calculation, we find vertical bar Vub vertical bar =(4.5±0.5stat±0.3syst(+0.7/-0.5)FF)x10-3, where the last error is due to the normalization of the form factor
Additional details
Identifiers
- DOI
- 10.1103/PhysRevLett.97.211801;
- arXiv
- arXiv:hep-ex/0607089v2;
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 97
- Journal Issue
- 21
- Journal Page Range
- p. 211801-211801.7
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38024358
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- B NEUTRAL MESONS; B PLUS MESONS; BRANCHING RATIO; FORM FACTORS; HADRONIC PARTICLE DECAY; ISOSPIN; KOBAYASHI-MASKAWA MATRIX; MOMENTUM TRANSFER; NEUTRINOS; PIONS MINUS; QUANTUM CHROMODYNAMICS
- Descriptors DEC
- B MESONS; BEAUTY MESONS; BEAUTY PARTICLES; BOSONS; DECAY; DIMENSIONLESS NUMBERS; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; HADRONS; LEPTONS; MASSLESS PARTICLES; MATRICES; MESONS; PARTICLE DECAY; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY
Optional Information
- Notes
- (c) 2006 The American Physical Society
- Collaborations
- BABAR Collaboration