A note on the dispersive treatment of K→ππ with the kaon off-shell

M Büchler, G Colangelo, J Kambor, F Orellana
2001 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