An Envelope Analysis of GeV-Scale Heavy Neutral Lepton Constraints: Implications for Neutrino-Portal Dark Matter

Author(s)	Ms. Yashasvi Saraff
Country	India
Abstract	Heavy Neutral Leptons (HNLs) are hypothetical particles that may explain neutrino masses and connect to dark-matter models through weak mixing with Standard Model neutrinos. This study compiles and harmonizes exclusion limits from collider, fixed-target, and beam-dump experiments to produce a unified sensitivity envelope across the electron, muon, and tau flavor channels. Using publicly available datasets and a reproducible analysis pipeline, global exclusion contours were generated as functions of HNL mass and mixing strength. The results demonstrate that the electron and muon channels are strongly constrained up to the GeV scale, whereas the tau channel remains largely unexplored, indicating priority regions for future searches. This consolidated framework provides a transparent, data-driven reference for evaluating HNL parameter space relevant to dark-sector and neutrino-mass models.
Keywords	Heavy Neutral Leptons, Neutrino Portal, Dark Matter, Collider Neutrinos, FASER, Data Harmonization
Field	Physics > Mechanical Engineering
Published In	Volume 7, Issue 6, November-December 2025
Published On	2025-12-28
DOI	https://doi.org/10.36948/ijfmr.2025.v07i06.64397

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