Majorana CP-violating phases and NSI effects in Neutrino Decay

Abstract

In this work, we investigate the impact of neutrino decay in the presence of Non-Standard Interactions (NSI) along with the effects of the Majorana phase on neutrino decay in matter in the context of two-flavor neutrino oscillations. These effects are studied on neutrino oscillation probabilities $P_{αβ} \equiv P(ν_α \to ν_β)$, and the difference $ΔP_{αβ} \equiv P(ν_α \to ν_β) - P(\bar ν_α \to \barν_β)$ for several accelerator and reactor neutrino experiments. We find that for $P_{αβ}$, the influence of the Majorana phase on decay in matter can be replicated by the simultaneous presence of both decay and NSI. However, precise measurements of the $P_{αβ}$ and $ΔP_{αβ}$ observables have the potential to unequivocally identify the presence of the Majorana phase by discerning its effects from the concurrent presence of both decay and NSI.