TESTING QUANTUM-MECHANICS IN THE NEUTRAL KAON SYSTEM AT A PHI-FACTORY

In this paper the possibility of performing a Bell-type test of quantu m mechanics in the neutral kaon system at a phi-factory is discussed. It is shown that a Bell inequality can be formulated for this system u sing a formalism based on a kaon quasispin picture and taking into acc ount CP violation. Tiny violations of this inequality by quantum mecha nics could be experimentally tested at a high luminosity phi-factory, by exploiting either coherent K-S-K-L regeneration in a thin regenerat or, or single kaon quasispin oscillations in vacuum. The high precisio n detector of an experiment at a phi-factory, addressing direct CP vio lation in neutral kaon decays, could successfully perform such a test.