We have observed the rare decay B-0-->rho(+)rho(-) in a sample of 89 million B (b) over bar pairs recorded with the BABAR detector. The number of observed events is 88(-21)(+23)+/-9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be B(B-0-->rho(+)rho(-))=(25(-6-6)(+7+5))x10(-6) and Gamma(L)/Gamma=0.98(-0.08)(+0.02)+/-0.03, respectively.

Observation of the decay B-0 ->rho(+)rho(-) and measurement of the branching fraction and polarization

ANDREOTTI, Mirco;AZZOLINI, Virginia;CALABRESE, Roberto;CIBINETTO, Gianluigi;LUPPI, Eleonora;NEGRINI, Matteo;SARTI, Alessio;
2004

Abstract

We have observed the rare decay B-0-->rho(+)rho(-) in a sample of 89 million B (b) over bar pairs recorded with the BABAR detector. The number of observed events is 88(-21)(+23)+/-9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be B(B-0-->rho(+)rho(-))=(25(-6-6)(+7+5))x10(-6) and Gamma(L)/Gamma=0.98(-0.08)(+0.02)+/-0.03, respectively.
2004
Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, Jm; Hicheur, A; Karyotakis, Y; Lees, Jp; Tisserand, V; Zghiche, A; Palano, A; Pompili, A; Che...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1211542
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