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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
Particle physics
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:
It is part of: Physical Review Letters, 2006, vol. 97, num. 21, p. 211801
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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