# Searching for Heavy Neutral Leptons with Displaced Vertices at the LHC

## TL;DR

This paper explores the potential of the LHC to detect Heavy Neutral Leptons with displaced vertices, considering all active flavor mixings, to improve search strategies for these long-lived particles.

## Contribution

It provides a comprehensive analysis of LHC sensitivity to Heavy Neutral Leptons, including all flavor mixing effects, enhancing previous search approaches.

## Key findings

- LHC can effectively probe Heavy Neutral Leptons with displaced vertices.
- Including all flavor mixings broadens the detectable parameter space.
- Displaced vertex signatures offer promising discovery channels.

## Abstract

Heavy Neutral Leptons are naturally present in many well-motivated extensions of the Standard Model. If their mass is of few dozens of GeVs, they can be long-lived and lead to events with displaced vertices, giving rise to promising signatures due to the low background. We revisit the opportunities offered by the LHC to discover these long-lived states via searches with displaced vertices. We study in particular the implication on the parameter space sensitivity when all mixings to active flavors are taken into account.