Preon Model with Minimal Color-Flavor Number and Low Composite Energy Scale

摘要

A preon model with minimal color-flavor number and low composite energy scale is proposed. Three generations of massless quarks and leptons (but no exotic fermions) can be reproduced by assuming the global chiral symmetry SU(10) of the preon Lagrangian to be spontaneously and maximally broken down to unbroken chiral subgroup SU(3)sub(L) x SU(3)sub(R) x SU(2)sub(L) x U(1)sub(Y) which minimally contains the gauge group SU(3)sub(C) x SU(2)sub(L) x U(1)sub(Y) of the standard model as a subgroup. The 't Hooft anomaly matching condition naturally leads to the generation structure of quarks and leptons. A constraint from coupling of this theory to gravity is also considered. (ERA citation 11:026486)