Measurement of the B0→π−ℓ+ν and B+→η(')ℓ+ν branching fractions, the B0→π−ℓ+ν and B+→ηℓ+ν form-factor shapes, and determination of |Vub|
We report the results of a study of the exclusive charmless semileptonic decays, B + → η ( ' ) ℓ + ν and B 0 → π − ℓ + ν , undertaken with approximately 464 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector. The analysis uses events in which the signal B decays a...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/131743 |
| Acceso en línea: | https://hdl.handle.net/2445/131743 |
| Access Level: | acceso abierto |
| Palabra clave: | Física de partícules Experiments Particle physics |
| Sumario: | We report the results of a study of the exclusive charmless semileptonic decays, B + → η ( ' ) ℓ + ν and B 0 → π − ℓ + ν , undertaken with approximately 464 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B + → η ℓ + ν and B 0 → π − ℓ + ν decays in three and 12 bins of q 2 , respectively, from which we extract the f + ( q 2 ) form-factor shapes and the total branching fractions B ( B + → η ℓ + ν ) = ( 0.36 ± 0.05 stat ± 0.04 syst ) × 10 − 4 and B ( B 0 → π − ℓ + ν ) = ( 1.42 ± 0.05 stat ± 0.07 syst ) × 10 − 4 . We also measure B ( B + → η ′ ℓ + ν ) = ( 0.24 ± 0.08 stat ± 0.03 syst ) × 10 − 4 . We obtain values for the magnitude of the CKM matrix element | V u b | using three different QCD calculations. |
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