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 (B0 or B⎯⎯⎯0), and J/ψK0L or cc⎯⎯K0S 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 468×106 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.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Observation of Time-Reversal Violation in the B-0 Meson System. PHYSICAL REVIEW LETTERS, 109(21), 1-8 [10.1103/PhysRevLett.109.211801].

Observation of Time-Reversal Violation in the B-0 Meson System

PATRIGNANI, CLAUDIA;
2012

Abstract

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 (B0 or B⎯⎯⎯0), and J/ψK0L or cc⎯⎯K0S 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 468×106 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.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Observation of Time-Reversal Violation in the B-0 Meson System. PHYSICAL REVIEW LETTERS, 109(21), 1-8 [10.1103/PhysRevLett.109.211801].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu G.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537371
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