In this work, we study the lepton number violating W boson and top quark decays via intermediate on-shell Majorana neutrinos Nj into three charged leptons and a light neutrino. We discuss the neutrino oscillation effects present in the decay due to the small mass gap between the heavy neutrino states. We focus on a scenario that contains at least two heavy Majorana neutrinos in the mass range 2-80 GeV. The results indicate that the modulation of the branching ratios as a function of the distance between the vertices may be detected in a future experiment such as High-Luminosity Large Hadron Collider. As a secondary result, the CP-violating phases could be explored.
@article{arxiv.1805.00070,
title = {Probing heavy neutrino oscillations in rare W boson decays},
author = {Gorazd Cvetic and Arindam Das and Jilberto Zamora-Saa},
journal= {arXiv preprint arXiv:1805.00070},
year = {2019}
}