Phenomenology of GeV-scale Heavy Neutral Leptons

TL;DR

This paper reviews and refines the phenomenology of GeV-scale heavy neutral leptons, including additional production and decay channels, QCD corrections, and clarifies their relevance for experimental searches.

Contribution

It extends previous analyses by incorporating more channels, refined treatments, and QCD corrections, providing updated results for experimental sensitivity studies.

Findings

Inclusion of additional production and decay channels.

Refined treatment with QCD corrections for 1 GeV HNLs.

Clarification of channel relevance across different mass ranges.

Abstract

We review and revise phenomenology of the GeV-scale heavy neutral leptons (HNLs). We extend the previous analyses by including more channels of HNLs production and decay and provide with more refined treatment, including QCD corrections for the HNLs of masses $\mathcal{O}(1)$ GeV. We summarize the relevance of individual production and decay channels for different masses, resolving a few discrepancies in the literature. Our final results are directly suitable for sensitivity studies of particle physics experiments (ranging from proton beam-dump to the LHC) aiming at searches for heavy neutral leptons.