Probing the Dirac or Majorana nature of the Heavy Neutrinos in pure leptonic decays at the LHC

Abstract

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 $W^{+}\to l^{+}{l}^{+}{l}^{{}^{\prime }-}\nu$ decay. In order to check the experimental feasibility of the model, we show, through a numerical analysis, that in the decay $W^{+}\to e^{+}{e}^{+}{\mu }^{-}\nu$ the two positrons in the final state can be distinguished for different ranges of the heavy neutrino masses. Finally, we estimated the number of events of $W^{+}\to e^{+}{e}^{+}{\mu }^{-}\nu$ for a Dirac and Majorana $N$ neutrino. For an integrated luminosity of 120 fb${}^{-1}$ at LHC RUN II, signals can be found if heavy-to-light neutrino mixings are $|U_{N\mu }{|}^2,|U_{Ne}{|}^2\gtrsim 10^{-6}$.

7 pages, 4 figures, references added

References in corpus (9)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Neutrino oscillations refitted
• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
• Same Sign versus Opposite Sign Dileptons as a Probe of Low Scale Seesaw Mechanisms
• Lepton Number Violation and W' Chiral Couplings at the LHC
• Distinguishing Dirac/Majorana Sterile Neutrinos at the LHC
• Lepton Number Violating Processes Mediated by Majorana Neutrinos at Hadron Colliders
• Jet substructure shedding light on heavy Majorana neutrinos at the LHC

Cited by in corpus (20)

• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• Search for heavy neutral leptons in events with three charged leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The Present and Future Status of Heavy Neutral Leptons
• Mapping the viable parameter space for testable leptogenesis
• On Lepton Number Violation in Heavy Neutrino Decays at Colliders
• Majorana vs Pseudo-Dirac Neutrinos at the ILC
• Bounds on right-handed neutrino parameters from observable leptogenesis
• Dirac vs. Majorana HNLs (and their oscillations) at SHiP
• Three-Body Decays of Heavy Dirac and Majorana Fermions
• New Benchmark Models for Heavy Neutral Lepton Searches
• Probing Neutrino Dirac Mass in Left-Right Symmetric Models at the LHC and Next Generation Colliders
• A quantitative study on helicity inversion in Majorana neutrino decays at the LHC
• Search for sterile neutrinos decaying into pions at the LHC
• Testing left-right symmetry with an inverse seesaw mechanism at the LHC
• Neutrino 2020: Theory Outlook
• Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders
• Cross-correlation Power Spectra and Cosmic Birefringence of the CMB via Photon-neutrino Interaction
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Quasi-Dirac neutrinos in the linear seesaw model
• Characterizing Heavy Neutral Fermions via their Decays