Inverse seesaw and $(g-2)$ anomalies in $B-L$ extended two Higgs doublet model

Abstract

We propose a gauged $U(1{)}_{B-L}$ extended two Higgs doublet model to explain both neutrino mass and lepton anomalous magnetic moments ($g-2$). Neutrino mass is generated via an inverse seesaw mechanism by introducing singlet fermions. Especially, we update the result of muon $g-2$ in light of the very recent report by E989 experiment at Fermilab, indicating $a_{\mu }^{\mathrm{FNAL}}=116592040(54)\times 10^{-11}$. Combining BNL result, we have the following deviation from the standard model prediction $\Delta a_{\mu }=(2.51\pm 5.9)\times 10^{-10}$ at 4.2 $\sigma$. Thanks to an appropriate assignment for $U(1{)}_{B-L}\times Z_2$ symmetry and larger $(20\lesssim )\tan \beta$ that is favoured by type-X model, we realize natural hierarchies among neutral fermions. The lepton anomalous magnetic moments can be induced at the one loop level by introducing an iso-spin singlet singly-charged boson. This charged scalar plays a significant role in evading chiral suppression of these phenomenologies. We show sizable lepton ($g-2$) can be obtained after satisfying all the flavour constraints, such as $\mu \to e\gamma$ and flavour conserving leptonic $Z$ boson decays.

arXiv comment15 pages, 4 tables, 2 figures; modified the muon g-2 updated by the very recent report of Fermilab

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• Systematically Testing Singlet Models for $(g-2{)}_{\mu }$
• $(\mathbf{g}-2{)}_{\mathbf{e},\mathbf{\mu }}$ in an extended inverse type-III seesaw
• Gauged Inverse Seesaw from Dark Matter
• Neutrino masses and magnetic moments of electron and muon in the Zee Model
• HNL mass degeneracy: implications for low-scale seesaws, LNV at colliders and leptogenesis
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• Marriage between neutrino mass and flavor anomalies
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• The Muon Magnetic Moment and Physics Beyond the Standard Model
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