Sub-dominant Type II Seesaw as an Origin of Non-zero ${\theta }_{13}$ in SO(10) model with TeV scale $Z^{\prime }$ Gauge Boson

Abstract

We discuss a class of left-right symmetric models where the light neutrino masses originate dominantly from type I seesaw mechanism along with a sub-dominant type II seesaw contribution. The dominant type I seesaw gives rise to tri-bimaximal type neutrino mixing whereas sub-dominant type II seesaw acts as a small perturbation giving rise to non-zero ${\theta }_{13}$ in our model which also has TeV scale right-handed neutrinos and $Z^{\prime }$ gauge boson thereby making the model verifiable at current accelerator experiments. Sub-dominant type II and dominant type I seesaw can be naturally accommodated by allowing spontaneous breaking of D-parity and $SU(2{)}_R$ gauge symmetry at high scale and allowing TeV scale breaking of $U(1{)}_R\times U(1{)}_{B-L}$ into $U(1{)}_Y$. We also embed the left-right model in a non-supersymmetric $SO(10)$ grand unified theory (GUT) with verifiable TeV scale $Z^{\prime }$ gauge boson. Drawing it to an end, we scrutinize in detail the evaluation of one-loop renormalization group evolution for relevant gauge couplings and estimation of the proton life time which can be accessible to the foreseeable experiments. And in the aftermost part we make an estimation of branching ratio for lepton flavor violating process $\mu \to e+\gamma$ as a function of type II seesaw strength due to doubly charged component of the right handed Higgs triplet with mass at the TeV scale, which can be accessible at ongoing experiments.

v2: 30 pages, 8 figures, minor revision, matches the version to be published in Nuclear Physics B

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