Diagonal Matrix Elements of the Effective Hamiltonian for $K^0-{\bar{K}}^0$ System in One Pole Approximation

Abstract

We study the properties of time evolution of the $K^0-{\bar{K}}^0$ system in spectral formulation. Within the one--pole model we find the exact form of the diagonal matrix elements of the effective Hamiltonian for this system. It appears that, contrary to the Lee--Oehme--Yang (LOY) result, these exact diagonal matrix elements are different if the total system is CPT--invariant but CP--noninvariant.

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