Abstract
We report the results of the CPLEAR experiment on T and CPT symmetries in the neutral-kaon system. Time-reversal non-invariance is observed for the first time by comparing the probabilities of a K ̄ 0 transforming into K 0 and of K 0 transforming into K ̄ 0 as a function of the neutral-kaon eigentime. CPT invariance is tested by measuring the parameter Re( δ CPT) with a precision of a few 10 −4, while Im( δ CPT) is determined from the Bell–Steinberger relation, with a precision of 10 −5. Moreover, the Bell–Steinberger constraint allows the CPT violation parameter Re( y) for the neutral-kaon semileptonic decays to be determined for the first time.
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