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Título: | Improved Measurement of B+->rho(+)rho(0) and Determination of the Quark-Mixing Phase Angle alpha |
Autor: | Babar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC ORCID; Oyanguren, Arantza CSIC ORCID; Aubert, B. | Fecha de publicación: | 10-abr-2009 | Editor: | American Physical Society | Citación: | Physical Review Letters 102 (14): 141802 (2009) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/ 10.1103/PhysRevLett.102.141802 | URI: | http://hdl.handle.net/10261/21980 | DOI: | 10.1103/PhysRevLett.102.141802 | ISSN: | 0031-9007 |
Aparece en las colecciones: | (IFIC) Artículos |
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phase angle alpha.pdf | 194,71 kB | Adobe PDF | Visualizar/Abrir |
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