Conference Presentation

PUBDB-2026-01812

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Searches formassive long-lived particlesin events with displaced verticeswith the ATLAS detector

Rousso, D. (Corresponding author)DESY*

2026

Report No.: ATL-PHYS-SLIDE-2026-045

Abstract: Many recent efforts at the LHC have been made to investigate the possibility that the new particle we are searching does not decay promptly but is instead long-lived. This has been done via many different creative signatures, including that of displaced vertices (DV), where the new long-lived particle decays into multiple visible tracks after having travelled a certain distance into the detector. This talk covers two such searches: a Run 2 DVs in events triggered by missing transverse energy, and a Run 3 DVs in events triggered by muons. The first search is the first to use a new "fuzzy" displaced vertex reconstruction algorithm, alongside the standard one, to effectively reconstruct cases where the long-lived particle decays into heavy quarks that are themselves slightly long-lived, hence causing the final visible decay products to not point back exactly to the same vertex, setting limits on Higgs Portal, SUSY, and DFSZ axino models. The second such search is the first to use a new displaced muon trigger, setting limits on RPV SUSY models.

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2026

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