A model of quark and lepton compositeness

TL;DR

This paper proposes a chiral $SU(15)$ gauge theory where quarks and leptons are composite particles made of preons, offering a unified framework that explains generations and avoids rapid proton decay.

Contribution

It introduces a novel $SU(15)$ gauge model where quarks and leptons are bound states of preons, with implications for unification and Higgs-like bound states.

Findings

Three generations naturally emerge from preon charges

Bound states of prebaryons can act as Higgs fields

The model prevents rapid proton decay through $SU(15)$ symmetry

Abstract

In the chiral $SU(15)$ gauge theory presented here, the quarks and leptons are bound states ("prebaryons") of massless preons. The Standard Model charges of the preons imply 3 generations of quarks and leptons, plus some vectorlike fermions lighter than the confining scale $\Lambda_{\rm pre}$. Under certain assumptions about the chiral dynamics, bound states of two prebaryons behave as Higgs fields. The QCD and electroweak groups may unify above $\Lambda_{\rm pre}$, while $SU(15)$ prevents rapid proton decay.