An Axion-Like Particle from an Seesaw with
arXiv:1906.05810 · doi:10.1016/j.physletb.2020.135273
Abstract
We investigate the decoupling of heavy right handed neutrinos in the context of an SO(10) GUT model, where a remnant anomalous symmetry is . In this model the see-saw mechanism which generates the neutrino masses is intertwined with the Stueckelberg mechanism, which leaves the CP-odd phase of a very heavy Higgs in the low energy spectrum as an axion-like particle. Such pseudoscalar is predicted to be ultralight, in the eV mass range. In this scenario, the remnant anomalous symmetry of the particles of the Standard Model is interpreted as due to the incomplete decoupling of the right handed neutrino sector. We illustrate this scenario including its realisation in the context of SO(10).
arXiv comment18 pages, revised final version, acepted for pubblication on Physics Letters B
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