Top quark as a probe of heavy Majorana neutrino at the LHC and future collider

TL;DR

This paper explores how top quark decays can be used at colliders to detect heavy Majorana neutrinos, providing stronger constraints on neutrino mixing parameters than previous methods.

Contribution

It introduces a novel collider-based approach to probe heavy Majorana neutrinos via top quark decay processes, improving existing bounds on neutrino mixing.

Findings

Method yields stronger limits on light-heavy neutrino mixing parameters.

Simulation shows potential for detection in the 15-80 GeV mass range.

Enhanced sensitivity compared to previous collider bounds.

Abstract

Right-handed (RH) Majorana neutrinos play a crucial role in understanding the origin of neutrino mass, the nature of dark matter and the mechanism of matter-antimatter asymmetry. In this work, we investigate the observability of heavy Majorana neutrino through the top quark neutrinoless double beta decay process $t \to b \ell^+ \ell^+ j j$ at hadron colliders. By performing detector level simulation, we demonstrate that our method can give stronger limits on the light-heavy neutrino mixing parameters $|V_{eN, \mu N}|$ in the mass range of 15 GeV $< m_N <$ 80 GeV than other existing collider bounds.