Abstract
We discuss a class of left-right symmetric theories with a universal seesaw mechanism for fermion masses and mixing and the implications for neutrinoless double beta ($0\nu\beta\beta$) decay where neutrino masses are governed by natural type-II seesaw dominance. The scalar sector consists of left- and right-handed Higgs doublets and triplets, while the conventional Higgs bidoublet is absent in this scenario. We use the Higgs doublets to implement the left-right and the electroweak symmetry breaking. On the other hand, the Higgs triplets with induced vacuum expectation values can give Majorana masses to light and heavy neutrinos and mediate $0\nu\beta\beta$ decay. In the absence of the Dirac mass terms for the neutrinos, this framework can naturally realize type-II seesaw dominance even if the right-handed neutrinos have masses of a few TeV. We study the implications of this framework in the context of $0\nu\beta\beta$ decay and gauge coupling unification.
Highlights
The neutrino oscillation experiments have established that the neutrinos have nonzero masses
We discuss a class of left-right symmetric theories with a universal seesaw mechanism for fermion masses and mixing and the implications for neutrinoless double beta (0νββ) decay where neutrino masses are governed by natural type-II seesaw dominance
We have presented a left-right symmetric model with additional vectorlike fermions in order to simultaneously explain the charged fermion and Majorana neutrino masses
Summary
The neutrino oscillation experiments have established that the neutrinos have nonzero masses. From a theoretical point of view several frameworks predict Majorana neutrinos, while the experimental searches are still inconclusive in this regard To this end the detection of neutrinoless double beta (0νββ) decay, which requires neutrinos to be Majorana particles regardless of the underlying mechanism, plays the crucial role in confirming the nature of the neutrinos. This rare process, the conversion of two neutrons into two protons, two electrons and nothing else, if observed, would pave a path towards the search for new physics beyond the standard model (SM).
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