Sterile Neutrino Decay

Sterile neutrinos are hypothetical particles introduced to resolve anomalies in neutrino oscillation experiments. In a 3+1 sterile model, one heavier, mostly sterile neutrino mass eigenstate joins the three light, mostly active neutrino mass eigenstates. This simple model does not fit the world's data well. We consider an extension of the 3+1 scenario where the heaviest mass eigenstate decays. This would modify results of searches for sterile neutrinos, as well as allowed regions obtained from global fits.