Hadrons are the class of particles containing quarks, that is, the baryons and mesons. Baryons as a class all carry one and the same identity charge, whose explicit form is the leptoquark neutrino. The leptons and leptoquark are the only known massive elementary particles. The quarks occur only as triplets confined to baryons or as quark-antiquark pairs in mesons. Quarks and leptons are produced by the decay of the leptoquark.
Ordinary matter consists of the electron, electron neutrino, and u, d quark energy level only.
A corresponding set of antiparticles also exists, but is not shown. This reaction requires an energy input. The quarks in the unreacted leptoquark expand to form the baryon. Ultraviolet Behavior of Non-Abelian Gauge Theories. Cronin, J. W. 1981.