Branching Fractions and CP Asymmetries in B0→π0π0, B+→π+π0, and B+→K+π0 Decays and Isospin Analysis of the B→ππ System
Based on a sample of 227 × 10 6 B ¯¯¯ B pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B ( B 0 → π 0 π 0 ) = ( 1.17 ± 0.32 ± 0.10 ) × 10 − 6 , and the asymmetry C π 0 π 0 = − 0.12 ± 0.56 ± 0.06 . The B 0 → π 0 π 0 signal has...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/140514 |
| Acceso en línea: | https://hdl.handle.net/2445/140514 |
| Access Level: | acceso abierto |
| Palabra clave: | Física de partícules Experiments Particle physics |
| Sumario: | Based on a sample of 227 × 10 6 B ¯¯¯ B pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B ( B 0 → π 0 π 0 ) = ( 1.17 ± 0.32 ± 0.10 ) × 10 − 6 , and the asymmetry C π 0 π 0 = − 0.12 ± 0.56 ± 0.06 . The B 0 → π 0 π 0 signal has a significance of 5.0 σ . We also measure B ( B + → π + π 0 ) = ( 5.8 ± 0.6 ± 0.4 ) × 10 − 6 , B ( B + → K + π 0 ) = ( 12.0 ± 0.7 ± 0.6 ) × 10 − 6 , and the charge asymmetries A π + π 0 = − 0.01 ± 0.10 ± 0.02 and A K + π 0 = 0.06 ± 0.06 ± 0.01 . Using isospin relations, we find an upper bound on the angle difference | α − α eff | of 35° at the 90% C.L. |
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