First observation and measurement of the branching fraction for the decay B 0 s → D ∗ s ∓ K ±
The first observation of the B 0 s → D ∗ s ∓ K ± decay is reported using 3.0 fb−1 of proton-proton collision data collected by the LHCb experiment. The D ∗ s ∓ mesons are reconstructed through the decay chain D ∗ s ∓ → γD ∓ s (K ∓ K ± π ∓). The branching fraction relative to that for B 0 s → D ∗ s...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | España |
| Recursos: | 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:20.500.14342/3172 |
| Acesso em linha: | http://hdl.handle.net/20.500.14342/3172 https://doi.org/10.1007/JHEP06(2015)130 |
| Access Level: | acceso abierto |
| Palavra-chave: | Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) Protons 539 |
| Resumo: | The first observation of the B 0 s → D ∗ s ∓ K ± decay is reported using 3.0 fb−1 of proton-proton collision data collected by the LHCb experiment. The D ∗ s ∓ mesons are reconstructed through the decay chain D ∗ s ∓ → γD ∓ s (K ∓ K ± π ∓). The branching fraction relative to that for B 0 s → D ∗ s − π + decays is measured to be B(B0s→D∗s∓K±)/B(B0s→D∗s−π+)=0.068±0.005+0.003−0.002, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of B(B0s→D∗s−π+) , the absolute branching fraction of B 0 s → D ∗ s ∓ K ± is measured as B(B0s→D∗s∓K±)=(16.3±1.2(stat)+0.7−0.5(syst)±4.8(norm))×10−5, where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel. |
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