Probing heavy neutrino oscillations in rare W boson decays

TL;DR

This paper investigates how heavy neutrino oscillations can affect rare W boson decays, proposing that future collider experiments might detect these effects and explore CP violation.

Contribution

It introduces a novel analysis of neutrino oscillation effects in W boson decays involving heavy Majorana neutrinos within the 2-80 GeV mass range.

Findings

Branching ratio modulations could be observed in future experiments.

Neutrino oscillations can influence lepton number violating decay signatures.

Potential to explore CP-violating phases in heavy neutrino sector.

Abstract

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.