CDF-II W boson mass in the Dirac scotogenic model

Abstract

The Dirac scotogenic model provides an elegant mechanism which explains small Dirac neutrino masses and neutrino mixing, with a single symmetry simultaneously protecting the “Diracness” of the neutrinos and the stability of the dark matter candidate. Here, we explore the phenomenological implications of the recent CDF-II measurement of the W boson mass in the Dirac scotogenic framework. We show that, in the scenario where the dark matter is mainly a [Formula: see text] scalar doublet, it can satisfy all the theoretical and experimental constraints along with the CDF-II W boson mass for the mass range of 58–86 GeV. However, unlike the Majorana scotogenic model, the Dirac version also has a “dark sector” SU(2)L singlet scalar. We show that if the singlet scalar is the lightest dark sector particle, i.e. the dark matter then all neutrino physics and dark matter constraints along with the constraints from oblique S, T and U parameters can be concurrently satisfied for W boson mass in the CDF-II mass range, where the singlet dark matter mass is constrained up to around 500 GeV.