Abstract
We consider a minimal extension of the Standard Model which advocates a dark neutrino sector charged under a hidden $U(1)^\prime$. We show that neutrino masses can arise radiatively in this model. The observed values are compatible with a light dark sector below the electroweak scale and would imply new heavy fermions which may be testable in the next generation of beam dump searches at DUNE, NA62 and SHIP.
Highlights
Neutrino oscillations have been established by several experiments [1], implying small but nonvanishing neutrino masses
A few notable examples of such alternatives are the inverse seesaw (ISS) [4] and the linear seesaw (LSS) [5], where the lightness of neutrino masses is explained by an approximate conservation of lepton number, and the extended seesaw (ESS) [6], where new heavy neutral fermions generally appear at small scales
We are interested in proposing a model for neutrino masses which is testable in current and future noncollider experiments, and as such we focus on a new physics scale which is below the electroweak one, vφ < vH
Summary
Neutrino oscillations have been established by several experiments [1], implying small but nonvanishing neutrino masses. A few notable examples of such alternatives are the inverse seesaw (ISS) [4] and the linear seesaw (LSS) [5], where the lightness of neutrino masses is explained by an approximate conservation of lepton number, and the extended seesaw (ESS) [6], where new heavy neutral fermions generally appear at small scales. This class of models assumes additional SM gauge neutral fermions that mix with light neutrinos, usually referred to as sterile neutrinos. After identifying the range of heavy neutrino parameters required to explain the observed light neutrino masses, we point out interesting phenomenological consequences
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