Testing CPT invariance by using C-even neutral-meson-antimeson correlated states

We consider the decays of a correlated neutral-meson-antimeson state with C -parity +1. We show that there is CPT noninvariance in the mixing of the ne utral mesons if, for any two decay modes f and g, the decay rate has a comp onent R-A which is antisymmetric under the interchange of the decay times t (1) and t(2). In particular, one may cleanly extract the CPT-noninvariance parameter with the help of R-A by using opposite-sign dilepton events.