We present results from an analysis of B-0 ((B) over bar (0)) -> rho(+)p(-) using 232 x 10(6) Upsilon(4S) -> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction f(L) = 0.978 +/- 0.014(stat)(-0.029)(+0.021)(syst) and the CP-violating parameters S-L = -0.33 +/- 0.24(stat)(-0.14)(+0.08)(syst) and C-L = -0.03 +/- 0.18(stat) +/- 0.09(syst). Using an isospin analysis of B -> rho rho decays, we determine the unitarity triangle parameter alpha. The solution compatible with the standard model is alpha = (100 +/- 13)degrees.
Titolo: | Improved measurement of the Cabibbo-Kobayashi-Maskawa angle alpha using B-0(B)->rho(+)rho(-) decays RID C-2728-2008 RID C-5223-2009 RID C-5719-2008 RID D-1055-2009 RID A-2675-2009 | |
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Data di pubblicazione: | 2005 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevLett.95.041805 | |
Handle: | http://hdl.handle.net/11384/4375 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |