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 aμFNAL=116592040(54)×10−11. Combining BNL result, we have the following deviation from the standard model prediction Δaμ=(2.51±5.9)×10−10 at 4.2 σ. Thanks to an appropriate assignment for U(1)B−L×Z2 symmetry and larger (20≲)tan⁡β that is favored 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 flavor constraints, such as μ→eγ and flavor conserving leptonic Z boson decays.