Dalitz plot analysis of B0 → D¯ 0πþπ− decays
The resonant substructures of B0 → D¯ 0πþπ− decays are studied with the Dalitz plot technique. In this study a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collisions collected by the LHCb detector is used. The branching fraction of the B0 → D¯ 0πþπ− decay in the region mð...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| 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:20.500.14342/3490 |
| Acceso en línea: | http://hdl.handle.net/20.500.14342/3490 https://doi.org/10.1103/PhysRevD.92.032002 |
| Access Level: | acceso abierto |
| Palabra clave: | Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) 539 |
| Sumario: | The resonant substructures of B0 → D¯ 0πþπ− decays are studied with the Dalitz plot technique. In this study a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collisions collected by the LHCb detector is used. The branching fraction of the B0 → D¯ 0πþπ− decay in the region mðD¯ 0πÞ > 2.1 GeV=c2 is measured to be ð8.46 0.14 0.29 0.40Þ × 10−4, where the first uncertainty is statistical, the second is systematic and the last arises from the normalization channel B0 → Dð2010Þ−πþ. The πþπ− S-wave components are modeled with the isobar and K-matrix formalisms. Results of the Dalitz plot analyses using both models are presented. A resonant structure at mðD¯ 0π−Þ ≈ 2.8 GeV=c2 is confirmed and its spin-parity is determined for the first time as JP ¼ 3−. The branching fraction, mass and width of this structure are determined together with those of the D 0ð2400Þ− and D 2ð2460Þ− resonances. The branching fractions of other B0 → D¯ 0h0 decay components with h0 → πþπ− are also reported. Many of these branching fraction measurements are the most precise to date. The first observation of the decays B0 → D¯ 0f0ð500Þ, B0 → D¯ 0f0ð980Þ, B0 → D¯ 0ρð1450Þ, B0 → D 3ð2760Þ−πþ and the first evidence of B0 → D¯ 0f0ð2020Þ are presented. |
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