Non-Unitary Neutrino Propagation From Neutrino Decay

Abstract

Neutrino propagation in space-time is not constrained to be unitary if very light states - lighter than the active neutrinos - exist into which neutrinos may decay. If this is the case, neutrino flavor-change is governed by a handful of extra mixing and "oscillation" parameters, including new sources of CP-invariance violation. We compute the transition probabilities in the two- and three-flavor scenarios and discuss the different phenomenological consequences of the new physics. These are qualitatively different from other sources of unitarity violation discussed in the literature.

8 pages, no figures

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• Effects of the Violation of the Equivalence Principle at DUNE
• $CP$ violation due to a Majorana phase in two flavor neutrino oscillations with decays
• Majorana CP-violating phases and NSI effects in Neutrino Decay
• Majorana CP Violation Insights from Decaying Neutrinos