Abstract
Mass spectra of composite fermions are studied in a preon model with approximate chiralSU 3,C×U 1,B-L×SU 2,f symmetry. Composite leptons and quarks will acquire masses, respectively, given bym 0 M f/ΛH andm C M f/ΛH, wherem 0,m c andM f are the mass scales for the chiralU 1,B-L,SU 3,C andSU 2,f symmetry breakings, respectively, and where ΛH is about the inverse sizes of leptons and quarks. The universal ratiom C/m 0∼O(10) could indicatem u/m e(≃5/0.5)∼m e/m μ (≃1200/105)∼m t/m τ (≃?/1800)∼O(10). An explicit exampl is given by the three-fermionic preon model of the Pati-Salam-Strathdee and Terazawa-Chikashige-Akama type. ChiralSU 2,f symmetry is dynamically broken at Λf by sextet «quarks» due to QCD andM f turns out to be of order of Λ f 2 /ΛH, where Λf is (1/2÷1) TeV. This model predicts light exotic fermions with masses of the order of 100 GeV.
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