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http://hdl.handle.net/2445/138265
Title: | Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 10-Apr-2009 |
Publisher: | American Physical Society |
Abstract: | We present improved measurements of the branching fraction B , the longitudinal polarization fraction f L , and the direct C P asymmetry A C P in the B meson decay channel B + → ρ + ρ 0 . The data sample was collected with the BABAR detector at SLAC. The results are B ( B + → ρ + ρ 0 ) = ( 23.7 ± 1.4 ± 1.4 ) × 10 − 6 , f L = 0.950 ± 0.015 ± 0.006 , and A C P = − 0.054 ± 0.055 ± 0.010 , where the uncertainties are statistical and systematic, respectively. Based on these results, we perform an isospin analysis and determine the Cabibbo-Kobayashi-Maskawa phase angle α = arg ( − V t d V ∗ t b / V u d V ∗ u b ) to be ( 92.4 + 6.0 − 6.5 ) ° . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.102.141802 |
It is part of: | Physical Review Letters, 2009, vol. 102, num. 14, p. 141802 |
URI: | http://hdl.handle.net/2445/138265 |
Related resource: | https://doi.org/10.1103/PhysRevLett.102.141802 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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