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Physics Letters B
It has been recently suggested that it is possible to calculate the effect of final state interactions in K -> pi pi amplitudes by applying dispersive methods to the amplitude with the kaon off-shell. We critically reexamine the procedure, and point out the effects of the arbitrariness in the choice of the off-shell field for the kaon.doi:10.1016/s0370-2693(01)01197-2 fatcat:egfqll2e2zeb7hwp5do7lobpyu