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 $P_{\alpha \beta }\equiv P({\nu }_{\alpha }\to {\nu }_{\beta })$, and the difference $\Delta P_{\alpha \beta }\equiv P({\nu }_{\alpha }\to {\nu }_{\beta })-P({\bar{\nu }}_{\alpha }\to {\bar{\nu }}_{\beta })$ for several accelerator and reactor neutrino experiments. We find that for $P_{\alpha \beta }$, 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 $P_{\alpha \beta }$ and $\Delta P_{\alpha \beta }$ 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.

Comments: 11 pages, 6 figures; Matches published version