# Time-Delayed Electrons from Higgs Decays to Right-Handed Neutrinos

## TL;DR

This paper explores the potential of the HL-LHC's timing capabilities to detect long-lived right-handed neutrinos produced from Higgs decays, focusing on electron final states and the impact of timing on sensitivity.

## Contribution

It introduces a timing-based analysis method for detecting long-lived right-handed neutrinos at the HL-LHC, enhancing sensitivity to rare Higgs decay modes.

## Key findings

- Timing information can significantly improve detection sensitivity.
- Higgs to right-handed neutrinos branching ratio can be probed down to 10^{-5}.
- Effective for a range of neutrino lifetimes from 0.1 to 100 meters.

## Abstract

We consider the physics reach at the high luminosity LHC (HL-LHC) using the timing capability of a minimum ionizing particle (MIP) timing layer and the electromagnetic calorimeter in the CMS experiment for a simplified right-handed neutrino effective theory. In the simplified model, the lightest right-handed neutrinos are produced through higgs decay with mean decay lengths of order $\mathcal{O}(0.1~{\rm m}-100~{\rm m}$) and then subsequently decay into final states that include electrons. We consider the effect of several different kinematic cuts for a timing based analysis of this model. We demonstrate that if timing information can be successfully incorporated into the event trigger, it is possible to probe the higgs branching ratio to two right-handed neutrinos to the order $\mathcal{O}(10^{-5}) $ for a range of different right-handed neutrino lifetimes.