Measurement of the B+ → ωℓ+ν branching fraction with semileptonically tagged B mesons
We report a measurement of the branching fraction of the exclusive charmless semileptonic decay B + → ω ℓ + ν , where ℓ is either an electron or a muon. We use samples of B + mesons tagged by a reconstructed charmed semileptonic decay of the other B meson in the event. The measurement is based on a...
| Autores: | , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/131779 |
| Acceso en línea: | https://hdl.handle.net/2445/131779 |
| Access Level: | acceso abierto |
| Palabra clave: | Física de partícules Experiments Mesuraments físics Particle physics Physical measurements |
| Sumario: | We report a measurement of the branching fraction of the exclusive charmless semileptonic decay B + → ω ℓ + ν , where ℓ is either an electron or a muon. We use samples of B + mesons tagged by a reconstructed charmed semileptonic decay of the other B meson in the event. The measurement is based on a data set of 426.1 fb − 1 of e + e − collisions at a center-of-mass energy of 10.58 GeV recorded with the BABAR detector at the PEP-II asymmetric-energy e + e − storage rings. We measure a branching fraction of B ( B + → ω ℓ + ν ) = ( 1.35 ± 0.21 ± 0.11 ) × 10 − 4 , where the uncertainties are statistical and systematic, respectively. We also present measurements of the partial branching fractions in three bins of q 2 , the invariant-mass squared of the lepton-neutrino system, and we compare them to theoretical predictions of the form factors. |
|---|