Using a data sample of 89x10(6) Y(4S)-->B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC, we measure the B-0((B) over bar (0))-->rho(+)rho(-) branching fraction as [30+/-4(stat)+/-5(syst)]x10(-6) and a longitudinal polarization fraction of f(L)=0.99+/-0.03(stat)(-0.03)(+0.04)(syst). We measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as C-L=-0.17+/-0.27(stat)+/-0.14(syst) and S-L=-0.42+/-0.42(stat)+/-0.14(syst). We exclude values of alpha between 19degrees and 71degrees (90% C.L.).
Study of the decay B-0((B)over-bar(0))->rho(+)rho(-), and constraints on the Cabibbo-Kobayashi-maskawa angle alpha
ANDREOTTI, Mirco;AZZOLINI, Virginia;CALABRESE, Roberto;CIBINETTO, Gianluigi;LUPPI, Eleonora;NEGRINI, Matteo;SARTI, Alessio;
2004
Abstract
Using a data sample of 89x10(6) Y(4S)-->B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC, we measure the B-0((B) over bar (0))-->rho(+)rho(-) branching fraction as [30+/-4(stat)+/-5(syst)]x10(-6) and a longitudinal polarization fraction of f(L)=0.99+/-0.03(stat)(-0.03)(+0.04)(syst). We measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as C-L=-0.17+/-0.27(stat)+/-0.14(syst) and S-L=-0.42+/-0.42(stat)+/-0.14(syst). We exclude values of alpha between 19degrees and 71degrees (90% C.L.).File in questo prodotto:
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