Improved Measurement of B[superscript +]-->rho[superscript +]rho[superscript 0] and Determination of the Quark-Mixing Phase Angle alpha
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Aubert-2009-Improved Measurement.pdf
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Author(s)
Cowan, Ray Franklin
Dujmic, Denis
Henderson, Shawn Wesley
Sciolla, Gabriella
Spitznagel, M.
Yamamoto, R. K.
Zhao, M.
Fisher, Peter H.
Alternative Title
Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α
Date Issued
April 2009
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
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)°.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.102.141802
