Majorana CP-violating phases and NSI effects in Neutrino Decay

TL;DR

This paper explores how neutrino decay, Non-Standard Interactions, and Majorana phases influence neutrino oscillation probabilities, highlighting the potential to detect Majorana phases through precise experimental measurements.

Contribution

It demonstrates that Majorana phases' effects can be distinguished from decay and NSI effects in neutrino oscillations, aiding future experimental identification.

Findings

Majorana phase effects can mimic decay and NSI effects in probabilities

Precise measurements can uniquely identify Majorana phases

Study conducted within two-flavor neutrino oscillation framework

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.