PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Astro-particle Physics and Cosmology
Probing secret interactions of eV-scale sterile neutrinos with the diffuse supernova neutrino background
M.H. Reno,* Y.S. Jeong, S. Palomares-Ruiz, I. Sarcevic
*corresponding author
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Pre-published on: December 07, 2020
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While three flavors of ``active'' neutrinos are consistent with mixing angle results within error bars, there are anomalies may be hints of physics beyond the standard model that can accommodate a fourth mostly ``sterile" neutrino species with an eV-scale mass and a mixing angle with active neutrinos of order $\theta_0\simeq 0.1$. We describe a scenario with
eV-scale sterile neutrinos that have self-interactions via a new gauge vector boson, a ``secret'' mediator $\phi$. We show that their production in the early Universe via mixing with active neutrinos is consistent with Big Bang Nucleosynthesis and free-streaming constraints in the Cosmic Microwave Background epoch. For $M_\phi=4-8$ keV and sterile neutrino coupling $g_s=10^{-4}$, we find that resonant interactions of diffuse supernova neutrinos with relic sterile neutrinos in transit to the Earth would cause spectral dips in the neutrino flux. We illustrate the corresponding (anti-)neutrino event distributions as a function of energy in the DUNE (Hyper-Kamiokande) detector.
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