A comparative study of 0νββ decay in symmetric and asymmetric left-right model

doi:10.1016/j.nuclphysb.2020.115000

Abstract

We study the new physics contributions to neutrinoless double beta decay ( $0 ν β β$ ) in a TeV scale left-right model with spontaneous D-parity breaking mechanism where the values of the $S U {(2)}_{L}$ and $S U {(2)}_{R}$ gauge couplings, $g_{L}$ and $g_{R}$ are unequal. Neutrino mass is generated in the model via gauge extended inverse seesaw mechanism. We embed the model in a non-supersymmetric $S O (10)$ GUT with a purpose of quantifying the results due to the condition $g_{L} \neq g_{R}$ . We compare the predicted numerical values of half life of $0 ν β β$ decay, effective Majorana mass parameter and other lepton number violating parameters for three different cases; (i) for manifest left-right symmetric model ( $g_{L} = g_{R}$ ), (ii) for left-right model with spontaneous D parity breaking ( $g_{L} \neq g_{R}$ ), (iii) for Pati-Salam symmetry with D parity breaking ( $g_{L} \neq g_{R}$ ). We show how different contributions to $0 ν β β$ decay are suppressed or enhanced depending upon the values of the ratio $\frac{g_{R}}{g_{L}}$ that are predicted from successful gauge coupling unification.

Nuclear Physics B

Abstract

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