Proton decay and $\mu \to e+\gamma$ Connection in a Renormalizable SO(10) GUT for Neutrinos

Abstract

Supersymmetric SO(10) grand unified models with renormalizable Yukawa couplings involving {\bf 10}, {\bf 126} and {\bf 120} Higgs fields have been shown to give a very economical theory for understanding quark-lepton flavor in a unified framework. In previous papers, we showed how nucleon decay can be suppressed in these models without invoking cancellation, by choice of Yukawa flavor texture within a type II seesaw framework for neutrinos that explains all mixings and masses including the recently observed "large" ${\theta }_{13}$. In this follow-up paper, we extend our earlier work to the case of type I seesaw and show that the recently measured "large" ${\theta }_{13}$ can be accommodated in this case while suppressing proton decay. We then point out that the two cases (type I and II) lead to different testable predictions for $B(\mu \to e+\gamma )$ and $B(\tau \to \mu (e)+\gamma )$ as well as different flavor final states in nucleon decay. In particular, we find that for the type I seesaw case, $B(\tau \to \mu +\gamma )$ can be observable while at the same time suppressing $B(\mu \to e+\gamma )$, whereas in the type II seesaw case, $B(\tau \to \mu +\gamma )$ is always suppressed whereas $B(\mu \to e+\gamma )$ is observable.

arXiv comment27 pages, 2 figures

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• The design of the MEG II experiment
• Fits to SO(10) Grand Unified Models
• Revisiting fermion mass and mixing fits in the minimal SUSY $SO(10)$ GUT
• Relation between proton decay and PMNS phase in the minimal SUSY $SO(10)$ GUT
• Neutrino Sector and Proton Lifetime in a Realistic SUSY SO(10) Model