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
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Show full item recordAbstract
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
2009-04Department
Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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