Baryon masses in large Nc chiral perturbation theory

TL;DR

This paper combines the 1/Nc expansion with chiral perturbation theory to analyze baryon masses, including meson loop effects and symmetry breaking, providing insights into sigma terms and strangeness contributions.

Contribution

It introduces a framework that integrates 1/Nc expansion with chiral perturbation theory to study baryon mass spectra and symmetry breaking effects.

Findings

Meson loop contributions significantly affect baryon masses.

Explicit chiral and flavor symmetry breaking impact mass predictions.

Analysis of sigma terms and strangeness contributions enhances understanding of nucleon structure.

Abstract

We analyse the baryon mass spectrum in a framework which combines the 1/Nc expansion with chiral perturbation theory. Meson loop contributions involving the full SU(3) octet of pseudoscalar Goldstone bosons are evaluated, and the influence of explicit chiral and flavor symmetry breaking by non-zero and unequal quark masses is investigated. We also discuss sigma terms and the strangeness contribution to the nucleon mass.