Testing $\nu$MSM with indirect searches

TL;DR

This paper evaluates the potential of indirect searches for sterile neutrinos in the $ u$MSM model, concluding that their contributions are too small to compete with direct detection methods.

Contribution

It provides an estimation of sterile neutrino effects on lepton processes, showing their negligible impact on indirect search prospects in the $ u$MSM.

Findings

Sterile neutrino contributions are too small for indirect detection.

Indirect searches are less promising than direct measurements.

The $ u$MSM can explain neutrino oscillations, baryogenesis, and dark matter.

Abstract

We consider neutrino Minimal extension of the Standard Model ($\nu$MSM), which by introducing only three sterile neutrinos in sub electroweak region can explain active neutrino oscillations (via seesaw type I mechanism), baryon asymmetry of the Universe (leptogenesis via oscillations) and dark matter phenomena (with keV-scale sterile neutrino forming dark matter). We estimate sterile neutrino virtual contributions to various lepton flavor and lepton number violating processes. The contributions are too small, giving no chance for indirect searches to compete with direct measurements in exploring $\nu$MSM.