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Improved Measurement of B^+ → ρ^+ ρ^0 and Determination of the Quark-Mixing Phase Angle α (2009)

Abstract

We present improved measurements of the branching fraction B, the longitudinal polarization fraction f_L, and the direct CP asymmetry A_(CP) in the B meson decay channel B^+ → p^+p^0. The data sample was collected with the BABAR detector at SLAC. The results are B(B^+ → p^+p^0)=(23.7±1.4±1.4)×10^(-6), f_L=0.950±0.015±0.006, and A_(CP)=-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_(td)V^*_(tb)/V_(ud)V*ub) to be (92.4^(+6.0)_(-6.5))°.

Publication details

Download	http://authors.library.caltech.edu/16514/1/Aubert2009p2057Phys_Rev_Lett.pdf http://authors.library.caltech.edu/16514/2/EPAPS.pdf http://authors.library.caltech.edu/16514/3/README.TXT http://resolver.caltech.edu/CaltechAUTHORS:20091029-075304664
Publisher	American Physical Society
Repository	Caltech Authors (United States)
Type	Article, PeerReviewed
Relation	http://resolver.caltech.edu/CaltechAUTHORS:20091029-075304664 http://authors.library.caltech.edu/16514/