Search for heavy Majorana or Dirac neutrinos and right-handed W gauge bosons in final states with charged leptons and jets in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

A search for heavy right-handed Majorana or Dirac neutrinos N${}_R$ and heavy right-handed gauge bosons W${}_R$ is performed in events with energetic electrons or muons, with the same or opposite electric charge, and energetic jets. The search is carried out separately for topologies of clearly separated final-state products ("resolved" channel) and topologies with boosted final states with hadronic and/or leptonic products partially overlapping and reconstructed as a large-radius jet ("boosted" channel). The events are selected from pp collision data at the LHC with an integrated luminosity of 139 fb${}^{-1}$ collected by the ATLAS detector at $\sqrt{s}$ = 13 TeV. No significant deviations from the Standard Model predictions are observed. The results are interpreted within the theoretical framework of a left-right symmetric model, and lower limits are set on masses in the heavy right-handed W${}_R$ boson and N${}_R$ plane. The excluded region extends to about m(W${}_R$) = 6.4 TeV for both Majorana and Dirac N${}_R$ neutrinos at m(N${}_R$) < 1 TeV. N${}_R$ with masses of less than 3.5 (3.6) TeV are excluded in the electron (muon) channel at m(W${}_R$) = 4.8 TeV for the Majorana neutrinos, and limits of m(N${}_R$) up to 3.6 TeV for m(W${}_R$) = 5.2 (5.0) TeV in the electron (muon) channel are set for the Dirac neutrinos. These constitute the most stringent exclusion limits to date for the model considered.