Light composite fermions in a dynamical subquark model of pregauge interactions

Abstract

The masses of composite leptons and quarks are discussed in a “dynamical subquark model of pregauge interactions”. In this model, the leptons and quarks are made of a spinor and scalar subquark with equal mass, M, and the gauge bosons and Higgs scalar of the SU(3) c×SU(2) L×U(1) Y model are made of a subquark-antisubquark pair. The SU(2) L×U(1) Y symmetry is spontaneously broken by the composite Higgs scalar and the (scalar) subquark mass parameter is in turn bounded as M > 5.4 TeV (=2π( 2 G F −1) 1 2 where G F is the Fermi coupling constant). The spontaneously generated mass of a lepton or quark, m i ( n) ( i = 1, 2; n = 1 ∼ N g), is calculated to be: m i (n) = r i (n) = r i (n) × (4+3N g )α e.m. ( 2 G F −1) 1 2 /3 6 (=0.35r i (n) (4+3N g ) GeV), where r i (n) are the parameters satisfying that 0 ⩽ r i ( n) ⩽ 1 and Σ ( r i ( n) ) 2 = 1; N g is the total number of generations of the leptons and quarks; α e.m. is the fine structure constant. The appearance of light composite fermions is related to a specific mechanism of generating global chiral symmetries of the leptons and quarks. Global symmetries of scalar subquarks yield chiral symmetries of the leptons and quarks. Our model turns out to satisfy 't Hooft's anomaly conditions on massless composite fermions.