Tracing masses of ground-state light-quark mesons

TL;DR

This paper presents a nonperturbative, symmetry-preserving calculation of the light-quark meson spectrum, highlighting the role of dynamical chiral symmetry breaking and the anomalous chromomagnetic moment in meson mass splitting.

Contribution

It introduces a novel nonperturbative approach that incorporates dynamical chiral symmetry breaking effects to accurately estimate the masses of light-quark mesons.

Findings

Clarifies the link between DCSB and vector-axial-vector meson splitting.

Highlights the importance of the anomalous chromomagnetic moment of dressed-quarks.

Provides estimates for heavier light-quark meson masses.

Abstract

We describe a symmetry-preserving calculation of the meson spectrum, which combines a description of pion properties with reasonable estimates of the masses of heavier light-quark mesons, including axial-vector states. The kernels used in formulating the problem are essentially nonperturbative. They incorporate effects of dynamical chiral symmetry breaking (DCSB) that were not previously possible to express. Our analysis clarifies a causal connection between DCSB and the splitting between vector and axial-vector mesons, and exposes a key role played by the anomalous chromomagnetic moment of dressed-quarks in forming the spectrum.