A Subquark Model of Quarks and Leptons
K. Kakazu, K.-i. Matumoto · Progress of Theoretical Physics · 1980
We propose a subquark model of quarks and leptons in which the electroweak interaction of quarks and leptons comes from that of a subquark doublet and the other subquarks are electrically neutral. The fractional ratios of the electric charge between quarks and leptons are natural in our model.