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.
Highlights
We review and revise phenomenology of the GeV-scale heavy neutral leptons (HNLs)
Our final results are directly suitable for sensitivity studies of particle physics experiments aiming at searches for heavy neutral leptons
We review and revise phenomenology of the heavy neutral leptons (HNLs) with masses in the GeV range
Summary
We review and revise phenomenology of the heavy neutral leptons (HNLs) with masses in the GeV range. The interest to these particles has recently increased, since it was recognized that they are capable of resolving 3 major observational BSM phenomena: neutrino oscillation, baryon asymmetry of the universe and dark matter [1, 2] We collect all relevant phenomenological results and present them with the unified notation, discussion of the relevance of the individual channels and references to the latest values of phenomenological parameters (meson form factors) that should be used in practical application. The relevance of individual channels depending on the masses of HNLs is present in the resulting table 5. We discuss existing discrepancies in the literature, pointing out the way of obtaining the correct results and analyze new channels of production and new modes of decay neglected in the previous literature
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