First evidence for the two-body charmless baryonic decay B0→pp¯¯¯
The results of a search for the rare two-body charmless baryonic decays B0→pp¯¯¯ and B0s→pp¯¯¯ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb−1, of pp collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of...
| 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:20.500.14342/3083 |
| Acceso en línea: | http://hdl.handle.net/20.500.14342/3083 https://doi.org/10.1007/JHEP10(2013)005 |
| Access Level: | acceso abierto |
| Palabra clave: | Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) 539 |
| Sumario: | The results of a search for the rare two-body charmless baryonic decays B0→pp¯¯¯ and B0s→pp¯¯¯ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb−1, of pp collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of B0→pp¯¯¯ candidates with respect to background expectations is seen with a statistical significance of 3.3 standard deviations. This is the first evidence for a two-body charmless baryonic B 0 decay. No significant B0s→pp¯¯¯ signal is observed, leading to an improvement of three orders of magnitude over previous bounds. If the excess events are interpreted as signal, the 68.3% confidence level intervals on the branching fractions are $ B(B0→pp¯¯¯)=1.47+0.62+0.35−0.51−0.14×10−8,B(Bs→pp¯¯¯)=2.84+2.03+0.85−1.68−0.18×10−8, $ where the first uncertainty is statistical and the second is systematic. |
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