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

M. Buechler·G. Colangelo·J. Kambor·F. Orellana
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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.

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M. Buechler, G. Colangelo, J. Kambor, F. Orellana. 2001-08-17. A note on the dispersive treatment of K -> pi pi with the kaon off-shell. https://doi.org/10.1016/s0370-2693(01)01197-2

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