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

DOI10.1016/J.NUCLPHYSB.2022.115716zbMATH Open1489.81067arXiv2103.13149OpenAlexW3136130165MaRDI QIDQ2121309

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Publication date: 4 April 2022

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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 $a_m{u}^{mFNAL}=116592040(54)imes10^{-11}$. Combining BNL result, we have the following deviation from the standard model prediction $Delta{a}_{m}u=(2.51pm5.9)imes10^{-10}$ at 4.2 $sigma$. Thanks to an appropriate assignment for $U(1{)}_{B-L}imes{Z}_2$ symmetry and larger $$ 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 $muoegamma$ and flavour conserving leptonic $Z$ boson decays.

Full work available at URL: https://arxiv.org/abs/2103.13149

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