# Sterile neutrino searches via displaced vertices at LHCb

## TL;DR

This paper assesses LHCb's displaced vertex searches to constrain sterile neutrino properties, providing the strongest current limits and forecasts for future data runs in the 4.5-10 GeV mass range.

## Contribution

It offers the first detailed analysis of LHCb's displaced vertex data for sterile neutrino constraints and forecasts future sensitivities for upcoming LHC runs.

## Key findings

- Current data sets the most stringent limits on active-sterile mixing for 4.5-10 GeV neutrinos.
- Forecasts indicate improved sensitivity with future LHCb data and high-luminosity phase.
- Results help narrow down sterile neutrino parameter space in the specified mass range.

## Abstract

We explore the sensitivity of displaced vertex searches at LHCb for testing sterile neutrino extensions of the Standard Model towards explaining the observed neutrino masses. We derive estimates for the constraints on sterile neutrino parameters from a recently published displaced vertex search at LHCb based on run 1 data. They yield the currently most stringent limit on active-sterile neutrino mixing in the sterile neutrino mass range between 4.5 GeV and 10 GeV. Furthermore, we present forecasts for the sensitivities that could be obtained from the run 2 data and also for the high-luminosity phase of the LHC.