Spectrum of hadrons with strangeness

TL;DR

This paper presents a unified calculation of strange and nonstrange hadron spectra using Dyson-Schwinger equations, emphasizing the role of dynamical chiral symmetry breaking in predicting baryon and meson properties.

Contribution

It introduces a symmetry-preserving Dyson-Schwinger equation framework that accurately predicts hadron spectra, including strange baryons, within a single consistent approach.

Findings

DCSB critically influences hadron mass spectra.

Baryon structure is largely flavor-blind.

Radial excitations are dominated by axial-vector diquark correlations.

Abstract

We describe a calculation of the spectrum of strange and nonstrange hadrons that simultaneously correlates the dressed-quark-core masses of meson and baryon ground- and excited-states within a single framework. The foundation for this analysis is a symmetry-preserving Dyson-Schwinger equation treatment of a vector-vector contact interaction. Our results exemplify and highlight the deep impact of dynamical chiral symmetry breaking on the hadron spectrum: an accurate description of the meson spectrum entails a similarly successful prediction of the spectrum of baryons, including those with strangeness. The analysis also provides numerous insights into baryon structure. For example, that baryon structure is largely flavour-blind, the first radial excitation of ground-state baryons is constituted almost entirely from axial-vector diquark correlations, and DCSB is the foundation for the ordering of low-lying baryon levels; viz., (1/2)^+, (1/2)^+, (1/2)^-.