Year: 2024
Type: conference-paper
Abstract: A summary of searches for heavy neutral leptons (HNLs) at the ATLAS experiment at the Large Hadron Collider is presented. This includes partial and full Run 2 rare $W$ decay searches through lepton number violation and displaced vertices alongside $WW$ scattering events. The searches for HNLs consider lepton number violating decays of the $W$ bosons. Additionally, the contributions of HNLs in $WW$ scattering are taken into account. This includes the first experimental test for a mixed-flavour Weinberg operator, denoted as $C^{(5)}_{e\mu}$. Furthermore, mixed-flavour HNL masses are explored at the TeV scale. No significant excesses are seen, and 95\% CL limits are set in first- and second-generation mixing matrix elements for HNL masses between 2 GeV and 20 TeV.
DOI: 10.22323/1.478.0032
Author: Gareth Bird
Institution: University of Cambridge
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4405647033