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

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.