$S$ -Matrix Description of $K_{L}$ and $K_{S}$ Decays

We show how the usual phenomenological description of the decays of the

K_{S}

and

K_{L}

mesons can be derived in a unified manner beginning from a description of the

K_{S}

and

K_{L}

states as overlapping resonances in a scattering matrix. The unitarity relations for overlapping resonances in a

CPT

-invariant (but not

CP

- or

T

-invariant) theory play a crucial role in the discussion, and are treated in detail.

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S-Matrix Description ofKLandKSDecays