The S-wave Λπphase shift is not large

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^\circ \le δ_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 δ_0 that is negative and much bigger in magnitude. We argue why that value should not be trusted.

3 pages, REVTeX

References in corpus (6)

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• Chiral unitary meson-baryon dynamics in the presence of resonances: Elastic pion-nucleon scattering
• Paramagnetic effect of light quark loops on Chiral Symmetry Breaking
• Vacuum fluctuations of \bar{q}q and values of low-energy constants
• Search for Direct CP Violation in Non-Leptonic Decays of Charged $\Xi$ and $\Lambda$ Hyperons
• Can the Lambda pi scattering phase shifts be large?

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