Abstract

Fermion mass generation for the third generation is considered within a unified Higgs model with a single pair of vector-spinor 144+144̅ of Higgs multiplets. Extending a previous work it is shown that much larger masses can arise for all the third generation fermions from mixing with 45 and 120 matter multiplets via the cubic couplings 16·45·144̅ and 16·120·144 in addition to the quartic couplings. Further, it is found that values of tan⁡β as low as 10 can allow for a b-τ-t unification consistent with the current data. The quartic and cubic couplings naturally lead to Dirac as well as Majorana neutrino masses necessary for the generation of a seesaw neutrino mass of the right size for the tau neutrino.

Notes

Originally published in Physical Review D v.81 (2009): 037701. DOI: 10.1103/PhysRevD.81.037701

Keywords

Fermion mass generaton, Higgs sector, SO(10) model, Yukawa couplings, quark and lepton masses

Subject Categories

Fermions

Disciplines

Physics

Publisher

American Physical Society

Publication Date

2-9-2009

Rights Information

Copyright (2009) American Physical Society

Rights Holder

American Physical Society

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