A note on the dispersive treatment of K -> pi pi with the kaon off-shell

Abstract

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.

Comments: Latex, 6 pages. Reference added