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.
Improved measurement of the Cabibbo-Kobayashi-Maskawa angle alpha using B-0(B)->rho(+)rho(-) decays
ANDREOTTI, Mirco;AZZOLINI, Virginia;CALABRESE, Roberto;CIBINETTO, Gianluigi;LUPPI, Eleonora;NEGRINI, Matteo;SARTI, Alessio;
2005
Abstract
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.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
