Analysis of two recent tests of T-invarianceP K KABIR Beams Physics Laboratory, University of Virginia, Charlottesville, Virginia 22904, USA Abstract. Inequality of the rates for K0 ® p+ e- [`(n)] and [`K]0 ® p- e+ n transitions, reported by CPLEAR, and an asymmetry in the distribution of the dihedral angle between the p+p- and e+e- planes in KL ® p+p-e+e- decays, found by KTeV, have been announced as demonstrations of T-noninvariance. These results are critically interpreted and compared as proofs of the failure of reciprocity. Keywords. Time-reversal; direct tests. Pacs No. 11.30.Er |