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Observation of Time-Reversal Violation in the B^{0} Meson System.

著者 Lees JP , Poireau V , Tisserand V , Garra Tico J , Grauges E , Palano A , Eigen G , Stugu B , Brown DN , Kerth LT , Kolomensky YG , Lynch G , Koch H , Schroeder T , Asgeirsson DJ , Hearty C , Mattison TS , McKenna JA , So RY , Khan A , Blinov VE , Buzykae
Phys Rev Lett.2012 Nov 21 ; 109(21):211801.
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Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.

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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[over ¯]^{0}), and J/ψK_{L}^{0} or cc[over ¯]K_{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[over ¯]^{0}→B_{-} and B_{-}→B[over ¯]^{0}, as a function of the time difference between the two B decays. Using 468×10^{6} BB[over ¯] 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.
PMID: 23215586 [PubMed - as supplied by publisher]
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