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A search for long-lived heavy neutral leptons (HNLs) is presented, whichconsiders the hadronic final state and coupling scenarios involving all threelepton generations in the 2-20 GeV HNL mass range for the first time. Eventscomprising two leptons (electrons or muons) and jets are analyzed in a datasample of proton-proton collisions, recorded with the CMS experiment at theCERN LHC at a centre-of-mass energy of 13 TeV, corresponding to an integratedluminosity of 138 fb$^{-1}$. A novel jet tagger, based on a deep neuralnetwork, has been developed to identify jets from an HNL decay using variousfeatures of the jet and its constituent particles. The network output can beused as a powerful discriminating tool to probe a broad range of HNL lifetimesand masses. Contributions from background processes are determined from data.No excess of events in data over the expected background is observed. Upperlimits on the HNL production cross section are derived as functions of the HNLmass and the three coupling strengths $V_{\ell\mathrm{N}}$ to each leptongeneration $\ell$ and presented as exclusion limits in the coupling-mass plane,as lower limits on the HNL lifetime, and on the HNL mass. In this search, themost stringent limit on the coupling strength is obtained for pure muoncoupling scenarios; values of $\lvert V_{\mu\mathrm{N}}\rvert^{2}\gt $ 5(4)$\times$10$^{-7}$ are excluded for Dirac (Majorana) HNLs with a mass of 10GeV at a confidence level of 95% that correspond to proper decay lengths of 17(10) mm.

Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton