Majorana neutrino signals at Belle-II and ILC

TL;DR

This paper investigates the potential to detect GeV-scale Majorana neutrinos at future collider experiments, finding that ILC has promising discovery prospects while Belle-II is unlikely to observe such signals.

Contribution

It introduces a model-independent effective theory approach to study Majorana neutrino detection at colliders, focusing on the process $e^+ e^- o u N o ext{photon} + ext{missing energy}$.

Findings

ILC can potentially discover Majorana neutrinos in the 0-30 GeV range.

Belle-II is unlikely to observe the signal.

The study provides feasibility analysis for future collider searches.

Abstract

For some theoretical and experimental considerations, the relatively light Majorana neutrinos at the GeV scale have been attracting some interest. In this article we consider a scenario with only one Majorana neutrino $N$, negligible mixing with the active neutrinos $\nu_{L}$, where the Majorana neutrino interactions could be described in a model independent approach based on an effective theory. Under such a framework, we particularly study the feasibility of observing the $N$ with mass in the range 0$-$30 GeV via the process $e^+ e^- \to \nu N \to\gamma + \slashed E$ in the future Belle-II and ILC experiments. The results show that it is unpromising for Belle-II to observe the signal, while ILC may easily make a discovery for the Majorana neutrino.