We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Y(4S) decays collected in 2001, bringing the data available to 32 x 10(6) B (B) over bar pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59 +/-0.14(stat) +/-0.05(syst) establishes CP violation in the B-0 meson system. We also determine \ gimel \ = 0.93 +/-0.09(stat) +/-0.03(syst), consistent with no direct CP violation.
Observation of CP violation in the B-0 meson system
LUSIANI, AlbertoMembro del Collaboration Group
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2001-01-01
Abstract
We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Y(4S) decays collected in 2001, bringing the data available to 32 x 10(6) B (B) over bar pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59 +/-0.14(stat) +/-0.05(syst) establishes CP violation in the B-0 meson system. We also determine \ gimel \ = 0.93 +/-0.09(stat) +/-0.03(syst), consistent with no direct CP violation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
