What question did this study set out to answer?

The study aims to explore hadron structures using the covariant Nambu–Jona-Lasinio model within quantum chromodynamics (QCD).

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April 10, 2026

A Nambu–Jona-Lasinio model of quantum chromodynamics and hadron structure

Key Points

The study aims to explore hadron structures using the covariant Nambu–Jona-Lasinio model within quantum chromodynamics (QCD).
Review of the NJL model as a chiral effective quark theory of QCD.
Analysis of spontaneous chiral symmetry breaking and confinement properties.
Comparison of parton distribution functions and electromagnetic form factors with existing data and theories.
Demonstrates how the NJL model replicates QCD properties effectively.
Shows consistency with parton distribution functions and form factors against experimental data.
Discusses implications for future experiments at EIC, EicC, and COMPASS/AMBER++.

Abstract

In this review paper, I present a study of the structure of hadrons computed in the covariant Nambu–Jona-Lasinio model, which serves as the chiral effective quark theory of QCD. I describe how the NJL model is treated to imitate the spontaneous chiral symmetry breaking and confinement properties of QCD. The consistency for the parton distribution functions and electromagnetic form factors, as internal structure observables, in comparison with existing data and other theoretical predictions, is also shown. The implications of mimicking the QCD properties in the NJL model for hadron structure observables, as well as the relevance of the results to EIC, EicC, and COMPASS/AMBER++ future experiments, are discussed.

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A Nambu–Jona-Lasinio model of quantum chromodynamics and hadron structure

Key Points

Abstract

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