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 tanβ 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.
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
Recommended Citation
Nath, Pran and Syed, Raza M., "Yukawa couplings and quark and lepton masses in an SO(10) model with a unified Higgs sector" (2009). Physics Faculty Publications. Paper 513.
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Notes
Originally published in Physical Review D v.81 (2009): 037701. DOI: 10.1103/PhysRevD.81.037701