PARTIAL-WIDTH FORMULATION OF UNITARITY SUM RULES FOR KL-KS DECAY

By including KS in the background which underlies KL, S-matrix unitarity can be used to derive a set of constraints on the partial decay amplitudes of the two resonances. The only constraint which does not explicitly involve the strong-interaction background phases is equivalent to the Bell-Steinberger sum rule. © 1969 The American Physical Society.