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Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha

Author(s)
Cowan, Ray Franklin; Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Spitznagel, M.; Yamamoto, R. K.; Zhao, M.; Fisher, Peter H.; ... Show more Show less
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Alternative title
Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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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)°.
Date issued
2009-04
URI
http://hdl.handle.net/1721.1/54806
Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Improved Measurement of B+--> rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha.” Physical Review Letters 102.14 (2009): 141802. © 2009 American Physical Society.
Version: Final published version
ISSN
0031-9007

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