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Title: | Improved Measurement of the Cabibbo-Kobayashi-Maskawa Angle α Using B0(¯¯¯B)→ρ+ρ− Decays |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 21-Jul-2005 |
Publisher: | American Physical Society |
Abstract: | We present results from an analysis of B 0 ( ¯¯¯ B 0 ) → ρ + ρ − using 232 × 10 6 Υ ( 4 S ) → B ¯¯¯ B decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction f L = 0.978 ± 0.014 ( stat ) + 0.021 − 0.029 ( syst ) and the C P -violating parameters S L = − 0.33 ± 0.24 ( stat ) + 0.08 − 0.14 ( syst ) and C L = − 0.03 ± 0.18 ( stat ) ± 0.09 ( syst ) . Using an isospin analysis of B → ρ ρ decays, we determine the unitarity triangle parameter α . The solution compatible with the standard model is α = ( 100 ± 13 ) ° . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.95.041805 |
It is part of: | Physical Review Letters, 2005, vol. 95, num. 4, p. 041805 |
URI: | http://hdl.handle.net/2445/140654 |
Related resource: | https://doi.org/10.1103/PhysRevLett.95.041805 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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