Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders

Abstract

We discuss the potential to observe lepton number violation (LNV) in displaced vertex searches for heavy neutral leptons (HNLs) at future lepton colliders. Even though a direct detection of LNV is impossible for the dominant production channel because lepton number is carried away by an unobservable neutrino, there are several signatures of LNV that can be searched for. They include the angular distribution and spectrum of decay products as well as the HNL lifetime. We comment on the perspectives to observe LNV in realistic neutrino mass models and argue that the dichotomy of Dirac vs Majorana HNLs is in general not sufficient to effectively capture their phenomenology, but these extreme cases nevertheless represent well-defined benchmarks for experimental searches. Finally, we present accurate analytic estimates for the number of events and sensitivity regions during the $Z$-pole run for both Majorana and Dirac HNLs.

Typos corrected, an error fixed, discussion extended, references added, link to GitHub repository with code for sensitivity region estimates added. Contribution to the proceedings of the 41st International Conference on High Energy Physics (ICHEP2022). Footnotes added with additional explanations that cannot be accommodated in the PoS page limit, but will hopefully make the document more useful

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• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• Large lepton number violation at colliders: predictions from the minimal linear seesaw mechanism
• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines
• Searches for Heavy Neutral Leptons at FCC-ee in final states including a muon
• Searches for Power-Law Warped Extra Dimensions