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@INPROCEEDINGS{Reuter:631133,
      author       = {Reuter, Juergen},
      title        = {{H}eavy {N}eutral {L}eptons ({HNL}) at {CEPC} (and other
                      $e^+ e^-$ colliders) — theory perspective},
      school       = {IFAE Barcelona},
      reportid     = {PUBDB-2025-01924},
      year         = {2025},
      abstract     = {In this talk, the importance of the search potential for
                      heavy neutral leptons (HNLs), i.e. heavy non-SM neutrinos,
                      are presented. The status of limits from cosmology, collider
                      and non-collider experiments is reviewed, especially the
                      limits from LHC and why searches at e+e- colliders like CEPC
                      can compete and even outperform. Different regimes of HNLs
                      are reviewed: disapperaring tracks, displaced vertices and
                      prompt production searches. Also, the possible
                      discrimination of the Dirac vs. Majorana case as well as
                      oscillation signatures of pseudo-Dirac neutrinos are
                      discussed.},
      month         = {Jun},
      date          = {2025-06-16},
      organization  = {2025 (European version of)
                       International CEPC Workshop, Barcelona
                       (Spain), 16 Jun 2025 - 19 Jun 2025},
      subtyp        = {Invited},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe
                      (390833306) / EAJADE - Europe-America-Japan Accelerator
                      Development and Exchange Programme (101086276)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)390833306 /
                      G:(EU-Grant)101086276},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/631133},
}