Intrinsic CPT violation and decoherence for entangled neutral mesons

We present a combined treatment of quantum-gravity-induced decoherence and intrinsic CPT violation in entangled neutral-kaon states. Our analysis takes into consideration two types of effects: first, those associated with the loss of particle–antiparticle identity, as a result of the ill-defined nature of the CPT operator, and second, effects due to the nonunitary evolution of the kaons in the space–time foam. By studying a variety of ϕ-factory observables, involving identical as well as general final states, we derive analytical expressions, to leading order in the associated CPT violating parameters, for double-decay rates and their time-integrated counterparts. Our analysis shows that the various types of the aforementioned effects may be disentangled through judicious combinations of appropriate observables in a ϕ factory.