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Conference Papers Year : 2019

A High-Granularity Timing Detector in ATLAS: Performance at the HL-LHC

Abstract

The large increase of pileup is one of the main experimental challenges for the HL-LHC physics program. A powerful new way to address this challenge is to exploit the time spread of the interactions to distinguish between collisions occurring very close in space but well separated in time. A High-Granularity Timing Detector, based on low gain avalanche detector technology, is proposed for the ATLAS Phase-II upgrade. Covering the pseudorapidity region between 2.4 and 4.0, with a timing resolution of 30 ps for minimum-ionizing particles, this device will significantly improve the performance in the forward region. High-precision timing greatly improves the track-to-vertex association, leading to a performance similar to that in the central region for the reconstruction of both jets and leptons, as well as for the tagging of heavy-flavor jets. These improvements in object reconstruction performance translate into important sensitivity gains and enhance the reach of the HL-LHC physics program. In addition, the High-Granularity Timing Detector offers unique capabilities for the online and offline luminosity determination.
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Dates and versions

hal-02097340 , version 1 (11-04-2019)

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Corentin Allaire. A High-Granularity Timing Detector in ATLAS: Performance at the HL-LHC. 11th International 'Hiroshima' Symposium on the Development and Application of Semiconductor TrackingDetectors, Dec 2017, Okinawa, Japan. pp.355-359, ⟨10.1016/j.nima.2018.05.028⟩. ⟨hal-02097340⟩
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