We report a measurement of the B branching fraction based on 211fb-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-â., "+Î=(1.33±0.17stat±0.11syst)Ã-10-4. 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 |Vub|=(4.5±0. 5stat±0.3syst+0.7-0.5FF)Ã-10-3, where the last error is due to the normalization of the form factor.

Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Measurement of the B → nlv branching fraction and determination of |Vub| with tagged B mesons. PHYSICAL REVIEW LETTERS, 97(21) [10.1103/PhysRevLett.97.211801].

Measurement of the B → nlv branching fraction and determination of |Vub| with tagged B mesons

CARPINELLI, Massimo;
2006

Abstract

We report a measurement of the B branching fraction based on 211fb-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-â., "+Î=(1.33±0.17stat±0.11syst)Ã-10-4. 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 |Vub|=(4.5±0. 5stat±0.3syst+0.7-0.5FF)Ã-10-3, where the last error is due to the normalization of the form factor.
Articolo in rivista - Articolo scientifico
Crystal lattices; Detectors; Energy transfer; High energy physics; Measurement theory; Quantum theory; Isospin symmetry; Matrix elements; Mesons; Momentum transfer; Charged particles
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2006). Measurement of the B → nlv branching fraction and determination of |Vub| with tagged B mesons. PHYSICAL REVIEW LETTERS, 97(21) [10.1103/PhysRevLett.97.211801].
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