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Lees, J P; Schroeder, T; Buzykaev, A R; Kravchenko, E A; Long, O; Vitug, G M; Campagnari, C; Hong, T M; Kroseberg, J; Martinez, A J; Hitlin, D G; Wagner, S R; Bernard, D; Clark, P J; Santoro, V; Piccolo, M; Patrignani, C; Bhuyan, B; Prasad, V; Adametz, A; Uwer, U; Mallik, U; Cochran, J; Gritsan, A V; Arnaud, N; Davier, M; Le Diberder, F; Stocchi, A; Wormser, G; Wright, D M; Gabathuler, E; Sacco, R; Lafferty, G D; Cenci, R; Roberts, D A; Lindemann, D; Biassoni, P; Palombo, F; Stracka, S; Kroeger, R; Simard, M; De Nardo, G; Losecco, J M; Honscheid, K; Brau, J; Sinev, N B; Strom, D; Torrence, E; Pompili, A; Rotondo, M; Hamon, O; Pacetti, S; Carpinelli, M; Forti, F; Lopes Pegna, D; Telnov, A V; Anulli, F; Gaspero, M; Mazzoni, M A; Hartmann, T; Leddig, T; Voss, C; Waldi, R; Hamel de Monchenault, G; Vasseur, G; Aston, D; Benitez, J F; Dorfan, J; Dunwoodie, W; Field, R C; Franco Sevilla, M; Fulsom, B G; Gabareen, A M; Innes, W R; Kim, P; Lindquist, B; Luth, V; Neal, H; Nelson, S; Pulliam, T; Ratcliff, B N; Salnikov, A A; Schindler, R H; Snyder, A; Wittgen, M; Wright, D H; Ziegler, V; Sekula, S J; Bellis, M; Puccio, E M T; Spanier, S M; Bianchi, F; Lanceri, L; Vitale, L; Ahmed, H; Albert, J; Bernlochner, F U; Tasneem, N; Harrison, P F; Band, H R
Physical review letters, 11/2012, Letnik: 109, Številka: 21Journal Article
Although CP violation in the B meson system has been well established by the B factories, there has been no direct observation of time-reversal violation. The decays of entangled neutral B mesons into definite flavor states (B(0) or B(0)), and J/ψK(L)(0) or ccK(S)(0) final states (referred to as B(+) or B(-)), allow comparisons between the probabilities of four pairs of T-conjugated transitions, for example, B(0) → B(-) and B(-) → B(0), as a function of the time difference between the two B decays. Using 468 × 10(6) BB pairs produced in Υ(4S) decays collected by the BABAR detector at SLAC, we measure T-violating parameters in the time evolution of neutral B mesons, yielding ΔS(T)(+) = -1.37 ± 0.14(stat) ± 0.06(syst) and ΔS(T)(-) = 1.17 ± 0.18(stat) ± 0.11(syst). These nonzero results represent the first direct observation of T violation through the exchange of initial and final states in transitions that can only be connected by a T-symmetry transformation.
