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T Violation and CPT Tests in Neutral-Meson Systems

The review covers transitions between M0 and M0bar in all four systems M0 = K0, D0, B0 and Bs. These systems are ideal laboratories for studying the discrete symmetries T and CPT. The properties of time reversal T are discussed in classical and quantum mechanics. T violation in K0 K0bar transitions has been observed in 1970 independent of assuming CPT symmetry by using the Bell-steinberger unitarity relation. Improvements of this observation are reviewed including the latest results in 2013. They show with high significance that CP violation in K0 K0bar transitions is only T violation without any CPT violation. Transitions in the other three systems do not show CP violation so far and therefore neither T nor CPT violation. The large observed CP violation in B0 -> J/psi K0 decays is presented to be compatible with only T and no CPT violation, the same for the very small but significant CP violation in decays K0 -> pi pi with isospin 2.

preprint2015arXivOpen access
Klaus R. Schubert
hep-exhep-ph
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Klaus R. Schubert

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