Home > Research > Publications & Outputs > Performance of the reconstruction of large impa...

Associated organisational unit

Links

Text available via DOI:

View graph of relations

Performance of the reconstruction of large impact parameter tracks in the inner detector of ATLAS

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
  • ATLAS Collaboration
Close
Article number1081
<mark>Journal publication date</mark>27/11/2023
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number11
Volume83
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Searches for long-lived particles (LLPs) are among the most promising avenues for discovering physics beyond the Standard Model at the Large Hadron Collider (LHC). However, displaced signatures are notoriously difficult to identify due to their ability to evade standard object reconstruction strategies. In particular, the ATLAS track reconstruction applies strict pointing requirements which limit sensitivity to charged particles originating far from the primary interaction point. To recover efficiency for LLPs decaying within the tracking detector volume, the ATLAS Collaboration employs a dedicated large-radius tracking (LRT) pass with loosened pointing requirements. During Run 2 of the LHC, the LRT implementation produced many incorrectly reconstructed tracks and was therefore only deployed in small subsets of events. In preparation for LHC Run 3, ATLAS has significantly improved both standard and large-radius track reconstruction performance, allowing for LRT to run in all events. This development greatly expands the potential phase-space of LLP searches and streamlines LLP analysis workflows. This paper will highlight the above achievement and report on the readiness of the ATLAS detector for track-based LLP searches in Run 3.