1992/10/20 by Zurab Berezhiani, Berezhiani, Zurab, Riccardo Rattazzi +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.hep-ph/9210252
openalex publication_date 1992/10/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The up-down splitting within quark families increases with the family number: mu ~ md, mc > ms, mt >> mb. We show an approach that realizes this feature of the spectrum in a natural way. We suggest that the mass hierarchy is first generated by radiative effects in a sector of heavy isosinglet fermions, and then projected to the ordinary light fermions by means of a seesaw mixing. The hierarchy appears then inverted in the light fermion sector. We present a simple left-right symmetric gauge model in which the P- and CP-parities and an isotopical "up-down" symmetry are softly (or spontaneously) broken in the Higgs potential. Experimentally consistent predictions are obtained. The Cabibbo angle is automatically in the needed range: ThetaC ~ 0.2. The top quark is naturally heavy, but not too heavy: mt < 150 GeV.