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Performance of the reconstruction of large impact parameter tracks in the inner detector of ATLAS
CERN, CH-1211 Geneva 23, Switzerland.;Aix Marseille Univ, CPPM, CNRS IN2P3, Marseille, France..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-9415-7903
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0009-0004-1439-5151
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
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Number of Authors: 29312023 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 83, no 11, article id 1081Article in journal (Refereed) Published
Abstract [en]

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) passwith 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.

Place, publisher, year, edition, pages
Springer , 2023. Vol. 83, no 11, article id 1081
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-343825DOI: 10.1140/epjc/s10052-023-12024-6ISI: 001144517400001Scopus ID: 2-s2.0-85184576937OAI: oai:DiVA.org:kth-343825DiVA, id: diva2:1840356
Note

QC 20240227

Available from: 2024-02-23 Created: 2024-02-23 Last updated: 2024-07-11Bibliographically approved

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Leopold, AlexanderLundberg, OlofLund-Jensen, BengtOhm, ChristianShaheen, RabiaStrandberg, Jonas

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