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Search for long-lived heavy neutral leptons with displaced vertices in proton-proton collisions at $\sqrt{s} =$ 13 TeV
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abstract
A search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana neutrinos, is performed in final states with three charged leptons (electrons or muons) using proton-proton collision data collected by the CMS experiment at $\sqrt{s} =$ 13 TeV at the CERN LHC. The data correspond to an integrated luminosity of 138 fb$^{-1}$. The HNLs could be produced through mixing with standard model neutrinos $\nu$. For small values of the HNL mass ($\lt$ 20 GeV) and the square of the HNL-$\nu$ mixing parameter (10$^{-7}$-10$^{-2}$), the decay length of these particles can be large enough so that the secondary vertex of the HNL decay can be resolved with the CMS silicon tracker. The selected final state consists of one lepton emerging from the primary proton-proton collision vertex, and two leptons forming a displaced, secondary vertex. No significant deviations from the standard model expectations are observed, and constraints are obtained on the HNL mass and coupling strength parameters, excluding previously unexplored regions of parameter space in the mass range 1-20 GeV and squared mixing parameter values as low as 10$^{-7}$.
Forward citations
Cited by 4 Pith papers
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Search for heavy Majorana neutrinos in vector boson scattering with $\tau$-lepton final states with the ATLAS detector
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A model with three right-handed neutrinos and a dark-matter portal generates the baryon asymmetry at a 2-TeV scale, but the benchmark used to match observations makes dark matter underabundant.
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Constraining Heavy Neutral Leptons Coupled to the Tau-Neutrino Flavor at the Large Hadron Collider
DV searches with no prompt-lepton tag can probe HNLs with dominant tau-neutrino mixing at the LHC, improving existing bounds by more than an order of magnitude at Run 2 luminosity.
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Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector
The ATLAS search finds no evidence of heavy neutral leptons in W boson decays and sets the strongest limits to date on their mixing with electron and muon neutrinos in the 15-30 GeV mass range.
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