Measurement of the B 0 s → μ + μ − Branching Fraction and Search for B 0 → μ + μ − Decays at the LHCb Experiment
A search for the rare decays B 0 s → μ + μ − and B 0 → μ + μ − is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1 fb − 1 of p p collisions at a center-of-mass energy of 7 TeV and 2 fb − 1 at 8 TeV. An excess of B 0 s → μ + μ − signal candidates...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universitat Ramon Llull (URL) |
| Repositorio: | DAU Arxiu Digital de la Universitat Ramon Llull |
| OAI Identifier: | oai:dau.url.edu:20.500.14342/3495 |
| Acceso en línea: | http://hdl.handle.net/20.500.14342/3495 https://doi.org/10.1103/PhysRevLett.111.101805 |
| Access Level: | acceso abierto |
| Palabra clave: | Gran col·lisionador d'hadrons (França i Suïssa) Interaccions d'hadrons Partícules (Física nuclear) Col·lisions (Física nuclear) 539 |
| Sumario: | A search for the rare decays B 0 s → μ + μ − and B 0 → μ + μ − is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1 fb − 1 of p p collisions at a center-of-mass energy of 7 TeV and 2 fb − 1 at 8 TeV. An excess of B 0 s → μ + μ − signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of B ( B 0 s → μ + μ − ) = ( 2.9 + 1.1 − 1.0 ) × 10 − 9 is obtained and an upper limit of B ( B 0 → μ + μ − ) < 7.4 × 10 − 10 at 95% confidence level is set. These results are consistent with the standard model expectations. |
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