Baryon polarization in low-energy unpolarized meson-baryon scattering

TL;DR

This paper calculates the polarization of baryons in low-energy unpolarized meson-baryon scattering using Unitarized BChPT, fitting parameters to experimental data and comparing with leading-order predictions.

Contribution

It introduces a method to compute baryon polarization in meson-baryon scattering within Unitarized BChPT and fits parameters to experimental data for the first time.

Findings

Predicted baryon polarization matches experimental data.

Identified differences between Unitarized BChPT and leading-order results.

Provided detailed analysis of spin asymmetries in meson-baryon scattering.

Abstract

We compute the polarization of the final-state baryon, in its rest frame, in low-energy meson--baryon scattering with unpolarized initial state, in Unitarized BChPT. Free parameters are determined by fitting total and differential cross-section data (and spin-asymmetry or polarization data if available) for $pK^-$, $pK^+$ and $p\pi^+$ scattering. We also compare our results with those of leading-order BChPT.