The S-wave Λπphase shift is not large

Details The S-wave Λπphase shift is not large The S-wave Λπphase shift is not large

2000-11-23

arxiv.org/abs/hep-ph/0011293v1

Phys.Rev. D64 (2001) 014006

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, REVTeX

Scientific paper

10.1103/PhysRevD.64.014006

We study the strong interaction S-wave \Lambda\pi phase shift in the region of the \Xi mass 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^\circ \le \delta_0 \le 1.1^\circ 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 \delta_0 that is negative and much bigger in magnitude. We argue why that value should not be trusted.

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