Muon ($g-2$) in $U(1{)}_{L_{\mu }-L_{\tau }}$ Scotogenic Model Extended with Vector like Fermion

Abstract

The latest results of anomalous muon magnetic moment at Fermilab show a discrepancy of 4.2 $\sigma$ between the Standard Model (SM) prediction and experimental value. In this work, we revisit $U(1{)}_{L_{\mu }-L_{\tau }}$ symmetry with in the paradigm of scotogenic model which explains muon ($g-2$) and neutrino mass generation, simultaneously. The mass of new gauge boson $M_{Z_{\mu \tau }}$ generated after the spontaneous symmetry breaking of $U(1{)}_{L_{\mu }-L_{\tau }}$ is constrained, solely, in light of the current neutrino oscillation data to explain muon ($g-2$). In particular, we have obtained two regions I and II, around 150 MeV and 500 MeV, respectively, in $M_{Z_{\mu \tau }}-g_{\mu \tau }$ plane which explain the neutrino phenomenology. Region I is found to be consistent with muon neutrino trident (MNT) bound ($g_{\mu \tau }$ $\le$ $10^{-3}$) to explain muon ($g-2$), however, region II violates it for mass range $M_{Z_{\mu \tau }}>300$ MeV. We, then, extend the minimal gauged scotogenic model by a vector like lepton (VLL) triplet ${\psi }_T$. The mixing of ${\psi }_T$ with inert scalar doublet $\eta$ leads to chirally enhanced positive contribution to muon anomalous magnetic moment independent of $Z_{\mu \tau }$ mass. Furthermore, we have, also, investigated the implication of the model for $0\nu \beta \beta$ decay and $CP$ violation. The non-observation of $0\nu \beta \beta$ decay down to the sensitivity of 0.01 eV shall refute the model. The model, in general,is found to be consistent with both $CP$ conserving and $CP$ violating solutions.

19 pages, 8 figures

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Cited by in corpus (1)

• The Decomposition of Neutron-Antineutron Oscillation Operators