The S-wave Λπphase shift is not large
Ulf-G. Meißner, José Antonio Oller
Abstract
We study the strong interaction S-wave Λπphase shift in the region of the Ξmass in the framework of a relativistic chiral unitary approach based on coupled channels. All parameters have been previously determined in a fit to strangeness S= -1 S-wave kaon-nucleon data. We find 0 δ0 1.1 in agreement with previous chiral perturbation theory calculations (or extensions thereof). We also discuss why a recent coupled channel K-matrix calculation gives a result for δ0 that is negative and much bigger in magnitude. We argue why that value should not be trusted.
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