Low-Scale See-Saw Mechanism and the Majorana Nature of Heavy Neutrinos

Abstract: We investigate the possibility to determine the Majorana nature of the heavy Majorana neutrinos present in the low-scale type I seesaw mechanism of neutrino mass generation in experiments at $e⁺ \text{-} e<sup>-$ and $μ⁺ \text{-} μ<sup>-$ colliders. This is done on the examples of two specific symmetry-protected seesaw scenarios with two right-handed (RH) singlet neutrinos and one seesaw realization with three RH neutrinos. We use the forward-backward symmetry in the angular distribution of the heavy neutral leptons produced in the $e⁺ \text{-} e<sup>-$ and $μ⁺ \text{-} μ<sup>-$ collisions as an indicator of their Majorana nature. Our results indicate that the experiments at FCCee during its first phase of operation have a remarkable potential not only to discover the heavy neutral leptons associated with the type I seesaw mechanism if they have masses smaller than the $Z<sup>0$-boson mass, but also to probe and provide evidence for their Majorana nature.