Dark matter implications of the KATRIN neutrino mass experiment

TL;DR

This paper explores how the KATRIN neutrino mass experiment can inform dark matter models, establishing a relation between neutrino mass and dark sector coupling, and analyzing implications for dark matter parameter space.

Contribution

It introduces a linear relation between neutrino mass and dark sector-Higgs coupling in the scotogenic model, linking experimental neutrino mass measurements to dark matter properties.

Findings

Neutrino mass measurement can determine the dark sector-Higgs coupling λ_5.

Correlations between dark matter mass and Yukawa coupling can be probed.

Results are independent of neutrino hierarchy and CP phase.

Abstract

We studied the effects of the absolute neutrino mass scale in the scotogenic radiative seesaw model. From a scan over the parameter space of this model, a linear relation between the absolute neutrino mass and the dark sector-Higgs coupling $\lambda_5= 3.1\times10^{-9}\ m_{\nu_e}/$eV has been established. With the projected sensitivity of the KATRIN experiment nearing cosmologically favored values, a neutrino mass measurement would fix the value of $\lambda_5$. Subsequent correlations between the DM mass and the Yukawa coupling between DM and the SM leptons can probe the fermion DM parameter space, when lepton flavor violation constraints are also considered. The results are independent of the neutrino mass hierarchy and the CP phase.