Chiral extrapolation of baryon mass ratios

TL;DR

This paper uses covariant Baryon Chiral Perturbation Theory to analyze lattice QCD data for baryon masses, improving the determination of low-energy constants and examining implications for the sigma term and SU(3) expansion convergence.

Contribution

It introduces a refined analysis of lattice data for baryon masses using covariant Baryon Chiral Perturbation Theory, enhancing the precision of low-energy constants.

Findings

Certain low-energy constants are determined more accurately.

The impact on the pion-nucleon sigma term is assessed.

Convergence properties of baryon mass expansions are analyzed.

Abstract

We analyze lattice data for octet baryon masses from the QCDSF collaboration employing manifestly covariant Baryon Chiral Perturbation Theory. It is shown that certain combinations of low-energy constants can be fixed more accurately than before from this data. We also examine the impact of this analysis on the pion-nucleon sigma term, and on the convergence properties of baryon mass expansions in the SU(3) symmetry limit.