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http://hdl.handle.net/2445/140423
Title: | Measurement of the B→πlν Branching Fraction and Determination of |Vub| with Tagged B Mesons |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 21-Nov-2006 |
Publisher: | American Physical Society |
Abstract: | We report a measurement of the B → π ℓ ν branching fraction based on 211 fb − 1 of data collected with the BABAR detector. We use samples of B 0 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 ( B 0 → π − ℓ + ν ) = ( 1.33 ± 0.17 stat ± 0.11 syst ) × 10 − 4 . We determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element | V u b | 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 | V u b | = ( 4.5 ± 0.5 stat ± 0.3 syst + 0.7 − 0.5 FF ) × 10 − 3 , where the last error is due to the normalization of the form factor. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.97.211801 |
It is part of: | Physical Review Letters, 2006, vol. 97, num. 21, p. 211801 |
URI: | http://hdl.handle.net/2445/140423 |
Related resource: | https://doi.org/10.1103/PhysRevLett.97.211801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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