Insights into Meson and Baryon Structure using Continuum Schwinger Function Methods

TL;DR

This paper discusses how continuum Schwinger function methods reveal the nonperturbative origins of hadron mass in QCD, emphasizing the roles of gluon mass-scale, effective charge, and dressed-quarks, and applies these insights to form factors.

Contribution

It provides a unified explanation of pion and proton form factors using continuum Schwinger function methods, linking hadron structure to emergent hadron mass phenomena.

Findings

Identification of three pillars supporting emergent hadron mass

Unified description of pion and proton form factors

Insights into the connection between confinement and EHM

Abstract

The bulk of visible mass is supposed to emerge from nonperturbative dynamics within quantum chromodynamics (QCD). Following years of development and refinement, continuum and lattice Schwinger function methods have recently joined in revealing the three pillars that support this emergent hadron mass (EHM); namely, a nonzero gluon mass-scale, a process-independent effective charge, and dressed-quarks with running masses that take constituent-like values at infrared momenta. One may argue that EHM and confinement are inextricably linked; and theory is now working to expose their manifold expressions in hadron observables and highlight the types of measurements that can be made in order to validate the paradigm. This contribution sketches these ideas via the unified explanation of pion and proton electromagnetic and gravitational form factors.