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Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α

Aubert, B. et al. (2009) Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α. Physical Review Letters, 102 (14). p. 141802. ISSN 0031-9007

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Abstract

We present improved measurements of the branching fraction B, the longitudinal polarization fraction fL, and the direct CP asymmetry ACP in the B meson decay channel B+→ρ+ρ0. The data sample was collected with the BABAR detector at SLAC. The results are B(B+→ρ+ρ0)=(23.7±1.4±1.4)×10-6, fL=0.950±0.015±0.006, and ACP=-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(-VtdVtb*/VudVub*) to be (92.4-6.5+6.0)°.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 04 Jan 2012 12:35
Last Modified: 04 Jan 2012 12:35
URI: http://eprints.hud.ac.uk/id/eprint/12315

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