A Neutrinophilic 2HDM as a UV Completion for the Inverse Seesaw Mechanism

Abstract

In Neutrinophilic Two Higgs Doublet Models, Dirac neutrino masses are obtained by forbidding a Majorana mass term for the right-handed neutrinos via a symmetry. We study a variation of such models in which that symmetry is taken to be a local U(1), leading naturally to the typical Lagrangian of the inverse seesaw scenario. The presence of a new gauge boson and of an extended scalar sector result in a rich phenomenology, including modifications to Z, Higgs and kaon decays as well as to electroweak precision parameters, and a pseudoscalar associated to the breaking of lepton number.

arXiv comment21 pages, 2 figures, matches the published version in JHEP

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• Hidden $U(1)$ gauge symmetry realizing a neutrinophilic two-Higgs-doublet model with dark matter
• Dark matter mass from relic abundance, an extra $U(1)$ gauge boson, and active-sterile neutrino mixing