© 2018 authors. We propose a strategy for distinguishing the Dirac/Majorana character of heavy neutrinos with masses below the W-boson mass, using purely leptonic decays at the LHC. The strategy makes use of a forward-backward asymmetry of the opposite-charge lepton in the W+→l+l+l′-ν decay. In order to check the experimental feasibility of the model, we show - through a numerical analysis and for different ranges of the heavy neutrino masses - that in the decay W+→e+e+μ-ν one can distinguish the positron from the W decay from the positron coming from the heavy neutrino. Finally, we estimate the number of events at the LHC Run II for a Dirac and Majorana N neutrino with an integrated luminosity of 120 fb-1. Signals can be found if heavy-to-light neutrino mixings are |UNμ|2,|UNe|210-6.
Arbelaéz, C., Dib, C., Schmidt, I., & Vasquez, J. C. (2018). Probing the Dirac or Majorana nature of the heavy neutrinos in pure leptonic decays at the LHC. Physical Review D. https://doi.org/10.1103/PhysRevD.97.056018