Type II Seesaw Dominance in Non-supersymmetric and Split Susy SO(10) and Proton Life Time

Abstract

Recently type II seesaw dominance in a supersymmetric SO(10) framework has been found useful in explaining large solar and atmospheric mixing angles as well as larger values of $thet{a}_{13}$ while unifying quark and lepton masses. An important question in these models is whether there exists consistency between coupling unification and type II seesaw dominance. Scenarios where this consistency can be demonstrated have been given in a SUSY framework. In this paper we give examples where type II dominance occurs in SO(10) models without supersymmetry but with additional TeV scale particles and also in models with split-supersummetry. Grand unification is realized in a two-step process via breaking of SO(10) to SU(5) and then to a TeV scale standard model supplemented by extra fields and an SU(5) Higgs multiplet ${15}_H$ at a scale about $10^{12}$ GeV to give type-II seesaw. The predictions for proton lifetime in these models are in the range ${\tau }_p^0=2\times 10^{35}$ yrs. to ${\tau }_p^0=6\times 10^{35}$ yrs.. A number of recent numerical fits to GUT-scale fermion masses can be accommodated within this model.

7 pages LaTeX, 3 figures, related areas: hep-ex, hep-th, astro-ph; Reference added, typo corrected, version to appear in Physical Review D

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• Implications of Recent Data on Neutrino Mixing and Lepton Flavour Violating Decays for the Zee Model
• Bilarge Neutrino Mixing and Abelian Flavor Symmetry
• New mechanism for Type-II seesaw dominance in SO(10) with low-mass Z-prime, RH neutrinos, and verifiable LFV, LNV, and proton decay
• Triplet Leptogenesis, Type-II Seesaw Dominance, Intrinsic Dark Matter, Vacuum Stability and Proton Decay in Minimal SO(10) Breakings
• Neutrino masses and mixings with non-zero ${\theta }_{13}$ in Type I+II Seesaw Models
• Fermion masses and mixing with tri-bimaximal in SO(10) with type-I seesaw
• High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and Verifiable LFV Decays in SU(5)
• Neutrino Mass, Coupling Unification, Verifiable Proton Decay, Vacuum Stability and WIMP Dark Matter in SU(5)
• Unification Predictions With or Without Supersymmetry
• SU(5) unification of two triplet seesaw and leptogenesis with dark matter and vacuum stability