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Observation of CP violation in the B(0) meson system

Aubert, B ; Boutigny, D ; Gaillard, J M ; Hicheur, A ; Karyotakis, Y ; Lees, J P ; Robbe, P ; Tisserand, V ; Palano, A ; Chen, G P ; Chen, J C ; Qi, N D ; Rong, G ; Wang, P ; Zhu, Y S ; Eigen, G ; Reinertsen, P L ; Stugu, B ; Abbott, B ; Abrams

Physical review letters, 27 August 2001, Vol.87(9), pp.091801 [Periódico revisado por pares]

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  • Título:
    Observation of CP violation in the B(0) meson system
  • Autor: Aubert, B ; Boutigny, D ; Gaillard, J M ; Hicheur, A ; Karyotakis, Y ; Lees, J P ; Robbe, P ; Tisserand, V ; Palano, A ; Chen, G P ; Chen, J C ; Qi, N D ; Rong, G ; Wang, P ; Zhu, Y S ; Eigen, G ; Reinertsen, P L ; Stugu, B ; Abbott, B ; Abrams
  • Assuntos: High Energy Physics - Experiment
  • É parte de: Physical review letters, 27 August 2001, Vol.87(9), pp.091801
  • Descrição: 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 Upsilon(4S) decays collected in 2001, bringing the data available to 32 x 10(6) BB macro 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 absolute value of lambda = 0.93+/-0.09(stat)+/-0.03(syst), consistent with no direct CP violation.
  • Idioma: Inglês

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