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Hicheur, A; Lees, J P; Rong, G; Wang, P; Reinertsen, P L; Abbott, B; Gill, M S; Groysman, Y; Perazzo, A; Pripstein, M; Ronan, M T; Wenzel, W A; Bright-Thomas, P G; Lewandowski, B; Bhimji, W; Cottingham, W N; McFall, J D; Buzykaev, A R; Mandelkern, M; Chun, S; MacFarlane, D B; Raven, G; Sharma, V; Levy, S L; Dorfan, D E; Turri, M; Williams, D C; Samuel, A; Devmal, S; Olivas, A; van Hoek, W C; Harton, J L; Soffer, A; Toki, W H; Dubitzky, R S; Ferrag, S; Roussot, E; Vasileiadis, G; Muheim, F; Swain, J E; Zallo, A; Monge, M R; Passaggio, S; Priano, C; Hamilton, R; Laplace, S; Shi, X; van Bibber, K; Kay, M; Aspinwall, M L; Gunawardane, N J; Dixon, P; Potter, R J; Shorthouse, H W; George, S; McMahon, T R; Salvatore, F; Flood, K T; Taras, P; Brau, J; Dorigo, A; Morandin, M; Frank, E D; Carpinelli, M; Turnbull, L; Wagoner, D E; Cavoto, G; del Re, D; Faccini, R; Mazzoni, M A; Geddes, N I; Kozanecki, W; Vasseur, G; Yumiceva, F X; Aston, D; Bulos, F; Convery, M R; Dorser, M; Glanzman, T; Himel, T; Kelsey, M H; Kim, P; Langennegger, U; Muller, D R; Soha, A; Spanier, S M; Wagner, S R; Kirkby, D; Meyer, T I; Izen, J M; Kitayama, I; Lou, X C; Turcotte, M; DiGirolamo, B; Bosisio, L; Della Ricci, G; Poropat, P; Band, H R; Pan, Y; Sekula, S J
Physical review letters, 2001-Aug-27, Letnik: 87, Številka: 9Journal Article
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.
