Revealing the Origin of Mass through Studies of Hadron Spectra and Structure

TL;DR

This paper discusses how emergent hadron mass (EHM) explains the majority of visible mass in the universe, highlighting its theoretical predictions and observable effects in hadron physics.

Contribution

It presents the theoretical framework of EHM and demonstrates its implications for hadron spectra, pion distribution, and internal charge and mass distributions.

Findings

EHM predicts a nonzero gluon mass-scale and effective charge.

EHM influences meson spectrum and pion distribution amplitude.

EHM shapes hadron charge and mass distributions.

Abstract

The Higgs boson is responsible for roughly 1% of the visible mass in the Universe. Obviously, therefore, Nature has another, very effective way of generating mass. In working toward identifying the mechanism, contemporary strong interaction theory has arrived at a body of basic predictions, viz. the emergence of a nonzero gluon mass-scale, a process-independent effective charge, and dressed-quarks with constituent-like masses. These three phenomena - the pillars of emergent hadron mass (EHM) - explain the origin of the vast bulk of visible mass in the Universe. Their expressions in hadron observables are manifold. This contribution highlights a few; namely, some of the roles of EHM in building the meson spectrum, producing the leading-twist pion distribution amplitude, and moulding hadron charge and mass distributions.