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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机译：我们研究了频谱公式中$ K ^ {0}-\ bar {K} ^ {0} $系统的时间演化特性。在单极模型中，我们找到了该系统有效哈密顿量的对角矩阵元素的确切形式。看起来，与Lee-Oehme-Yang（LOY）结果相反，如果整个系统是CPT（不变）而CP（是不变），则这些对角矩阵元素是不同的。
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