The CP-violating difference between the partial decay rates of a particle and antiparticle depends on final-state interactions. A general formalism is presented for calculating this difference based on CPT invariance and unitarity. Applications are given to 8 decays and the formalism is compared to the standard method using penguin graphs.

A p in general by the factor [ln(m, /mb )/6'] so that it is only the term u, a, P' that makes a significant new contribution because v, ))v " . We now once again include t perturbatively