DirectCP,T, and/orCPTviolations in theK0-

Abstract

The recent results on the CP violating parameters Re(ε ′ /ε) and ∆φ ≡ φ 00 − φ +− reported by the KTeV Collaboration are analyzed with a view to constrain CP , T and CP T violations in a decay process. Combining with some relevant data compiled by the Particle Data Group, we find Re(ε 2 − ε 0 ) = (0.85 ± 3.11) × 10 −4 and Im(ε 2 − ε 0 ) = (3.2 ± 0.7) × 10 −4 , where Re(ε I ) and Im(ε I ) represent respectively CP/CP T and CP/T violations in decay of K 0 and K 0 into a 2π state with isospin I.