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Scientific article
Open access
English

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

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 83, no. 11, 1081
Publication date2023
First online date2023-11-27
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.

eng
Keywords
  • P p: scattering
  • P p: colliding beams
  • Vertex: primary
  • Particle: long-lived
  • ATLAS
  • CERN LHC Coll
  • Tracks
  • Track data analysis
  • Performance
  • New physics: search for
  • Charged particle
  • Sensitivity
  • Efficiency
  • Tracking detector
  • Signature
  • Impact parameter
  • Phase space
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Performance of the reconstruction of large impact parameter tracks in the inner detector of ATLAS. In: European physical journal. C, Particles and fields, 2023, vol. 83, n° 11, p. 1081. doi: 10.1140/epjc/s10052-023-12024-6
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Article (Published version)
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ISSN of the journal1434-6044
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