An SO(10) model with adjoint fermions for double seesaw neutrino masses

Abstract

An $SO(10)$ model where the $10_H$ and $120_H$ representations are used for generating fermion masses is quite predictive, though due to the absence of $SU(2{)}_{L,R}$ triplet/singlet fields it cannot give rise to neutrino masses through the usual type-I or type-II seesaw mechanisms. In this paper for neutrino masses we propose an extension of such an $SO(10)$ model by adding fermions in the adjoint representation (${45}_F$) and a symmetry breaking scalar ${\overline{16}}_H$. The ${\overline{16}}_H$ couples the adjoint fermions to the standard fermions in ${16}_F$ and induces neutrino masses through the `double seesaw' mechanism. In order to enhance the predictivity of the model we impose $\mu -\tau$ flavour symmetry on the Yukawa matrices for $10_H$ and ${\overline{16}}_H$ whereas for the $120_H$ it is assumed to be antisymmetric. We discuss the conditions that the mass matrices must obey so that the model can reproduce the tri-bimaximal mixing pattern.

13 pages, 1 figure

References in corpus (10)

• Probing seesaw at LHC
• Upper Bound on the Mass of the Type III Seesaw Triplet in an SU(5) Model
• Grand unification of $\mu -\tau$ Symmetry
• Fermion masses and mixings in a renormalizable SO(10) x Z_2 GUT
• A renormalizable SO(10) GUT scenario with spontaneous CP violation
• Phenomenology of SUSY SU(5) with type I+III seesaw
• Type III Seesaw and Left-Right Symmetry
• Pinning down the New Minimal Supersymmetric GUT
• Type II see-saw dominance in SO(10)
• Correcting α_3(M_Z) in the NMSGUT

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• Effective Operator Bases for Beyond Standard Model Scenarios: An EFT compendium for discoveries
• Probing Leptoquark and Heavy Neutrino at LHeC
• Lepton Number Violation: Seesaw Models and Their Collider Tests
• Mirror symmetry: from active and sterile neutrino masses to baryonic and dark matter asymmetries
• A left-right symmetric model with SU(2)-triplet fermions