Exotic sterile neutrinos and pseudo-Goldstone phenomenology

Shakya, Bibhushan; Wells, James D.

doi:10.1007/jhep02(2019)174

Exotic sterile neutrinos and pseudo-Goldstone phenomenology

Journal Article · Tue Feb 26 00:00:00 EST 2019 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep02(2019)174· OSTI ID:1610975

Shakya, Bibhushan ^[1]; Wells, James D. ^[2]

Univ. of Cincinnati, OH (United States); Univ. of Michigan, Ann Arbor, MI (United States); DOE/OSTI
Univ. of Michigan, Ann Arbor, MI (United States)

We study the phenomenology of a light (GeV scale) sterile neutrino sector and the pseudo-Goldstone boson (not the majoron) associated with a global symmetry in this sector that is broken at a high scale. Such scenarios can be motivated from considerations of singlet fermions from a hidden sector coupling to active neutrinos via heavy right-handed seesaw neutrinos, effectively giving rise to a secondary, low-energy seesaw framework. This framework involves rich phenomenology with observable implications for cosmology, dark matter, and direct searches, involving novel sterile neutrino dark matter production mechanisms from the pseudo-Goldstone-mediated scattering or decay, modifications of BBN bounds on sterile neutrinos, suppression of canonical sterile neutrino decay channels at direct search experiments, late injection of an additional population of neutrinos in the Universe after neutrino decoupling, and measurable dark radiation.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0007859; SC0011719

OSTI ID:: 1610975

Alternate ID(s):: OSTI ID: 1647723

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 2 Vol. 2019; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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