Testing CPT and Quantum Mechanics in the K_0-Kbar_0 System

Abstract

I report a recent study done in collaboration with M.E. Peskin, on the time dependence of a kaon beam propagating according to a generalization of quantum mechanics due to Ellis, Hagelin, Nanopoulos and Srednicki, in which CP- and CPT-violating signatures arise from the evolution of pure states to mixed states. Constraints on the magnitude of its parameters are established on the basis of existing experimental data. New facilities such as phi-factories are shown to be particularly adequate to study this generalization from \qm\ and to disentangle its parameters from other CPT violating perturbations of the kaon system. ( To appear in Proceedings of the First International Conference on Phenomenology of Unification from Present to Future, Roma, ITALY -- March 23-26, 1994.)