TY  - JOUR
AU  - BABAR Collaboration (Lees, J. P. et al
AU  - Bernabeu, J.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Villanueva-Perez, P.
PY  - 2012
DA  - 2012//
TI  - Observation of Time-Reversal Violation in the B-0 Meson System
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 211801
EP  - 8pp
VL  - 109
IS  - 21
PB  - Amer Physical Soc
AB  - 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 bar (0)), and J/psi K-L(0) or c (c) over barK(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 bar (0) -> B- and B- -> (B) over bar (0), as a function of the time difference between the two B decays. Using 468 X 10(6) B (B) over bar pairs produced in Y(4S) decays collected by the BABAR detector at SLAC, we measure T-violating parameters in the time evolution of neutral B mesons, yielding Delta S-T(+) = -137 +/- 0.14(stat) +/- 0.06(syst) and Delta S-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.
SN  - 0031-9007
UR  - http://arxiv.org/abs/1207.5832
UR  - https://doi.org/10.1103/PhysRevLett.109.211801
DO  - 10.1103/PhysRevLett.109.211801
LA  - English
N1  - WOS:000311283800001
ID  - BABARCollaborationLees_etal2012
ER  -