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Open Access item Improved Measurement of B+->rho(+)rho(0) and Determination of the Quark-Mixing Phase Angle alpha

Authors:Babar Collaboration
Azzolini, Virginia
López-March, Neus
Martínez-Vidal, Fernando
Milanés, Diego A.
Oyanguren, Arantza
Aubert, B.
Issue Date:10-Apr-2009
Publisher:American Physical Society
Citation:Physical Review Letters 102 (14): 141802 (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+->rho(+)rho(0). The data sample was collected with the BABAR detector at SLAC. The results are B(B+->rho(+)rho(0))=(23.7 +/- 1.4 +/- 1.4)x10(-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 alpha=arg(-VtdVtb*/VudVub*) to be (92.4(-6.5)(+6.0))degrees.
Publisher version (URL):http://dx.doi.org/ 10.1103/PhysRevLett.102.141802
URI:http://hdl.handle.net/10261/21980
ISSN:0031-9007
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Appears in Collections:(IFIC) Artículos

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