Bell inequalities for K-0(K)over-bar(0) pairs from Phi-resonance decays - art. no. 094008

We analyze the premises of recent propositions to test local realism via th e Bell inequalities using neutral kaons from Phi resonance decays as entang led Einstein-Podolsky-Rosen pairs. We pay special attention to the derivati on of the Bell inequalities, or related expressions, for unstable and oscil lating kaon ''quasispin'' states and to the possibility of the actual ident ification of these states through their associated decay modes. We discuss an indirect method to extract probabilities to find these states by combini ng experimental information with theoretical input. However, we still find inconsistencies in previous derivations of the Bell inequalities. We show t hat the identification of the quasispin states via their associated decay m ode does not allow the free choice to perform different tests on them, a pr operty which is crucial to establish the validity of any Bell inequality in the context of local realism. In view of this we propose a different kind of Bell inequality in which the free choice or adjustability of the experim ental setup is guaranteed. We also show that the proposed inequalities are violated by quantum mechanics. [S0556-2821(99)08219-3].