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

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An SO(10) model where the 10H and 120H 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 Letter, for neutrino masses, we propose an extension of such an SO(10) model by adding fermions in the adjoint representation (45F) and a symmetry breaking scalar 16̄H. The 16̄H couples the adjoint fermions to the standard fermions in 16F and induces neutrino masses through the 'double seesaw' mechanism. In addition, we impose (i) a parity symmetry leading to hermitian Yukawa Matrices and (ii) a μ-τ flavor symmetry on the Yukawa matrices for 10H and 16̄H whereas for the 120H it is assumed to be antisymmetric. Thus we consider the model SO(10)⊗Z2(μ-τ)⊗Z2P. We discuss the conditions that the mass matrices must obey so that the model can reproduce the tri-bimaximal mixing pattern. © 2011 Elsevier B.V.

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Chakrabortty, J., Goswami, S., & Raychaudhuri, A. (2011). An SO(10) model with adjoint fermions for double seesaw neutrino masses. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 698(4), 265–270.

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