Fermion Masses in SO(10)

Details Fermion Masses in SO(10) Fermion Masses in SO(10)

1993-01-19

arxiv.org/abs/hep-ph/9301248v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

talk presented at DPF92, EFI-92-64, 4 pages Latex

Scientific paper

Yukawa coupling constant unification together with the known fermion masses is used to constrain SO(10) models. We consider the case of one (heavy) generation, with the tree-level relation $m_b=m_\tau$, calculating the limits on the intermediate symmetry breaking scales. This analysis extends previous analyses which addressed only the simplest symmetry breaking schemes. In the case where the low energy model is the standard model with one Higgs doublet, there are very strong constraints due to the known limits on the top mass and the tau neutrino mass. The two Higgs doublet case is less constrained. Finally we address the role of a speculative constraint on the tau neutrino mass, arising from the cosmological implications of anomalous $B+L$ violation in the early universe.

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