Hyperquarks and bosonic preon bound states

Abstract

In a model in which leptons, quarks, and the recently introduced hyperquarks are built up from two fundamental spin-$\frac{1}{2}$ preons, the standard model weak gauge bosons emerge as preon bound states. In addition, the model predicts a host of new composite gauge bosons, in particular, those responsible for hyperquark and proton decay. Their presence entails a left-right symmetric extension of the standard model weak interactions and a scheme for a partial and grand unification of nongravitational interactions based on, respectively, the effective gauge groups $\mathrm{SU}(6{)}_{P}$ and $\mathrm{SU}(9{)}_{G}$. This leads to a prediction of the Weinberg angle at low energies in good agreement with experiment. Furthermore, using evolution equations for the effective coupling strengths, we calculate the partial and grand unification scales, the hyperquark mass scale, as well as the mass and decay rate of the lightest hyperhadron.