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Performance of the ATLAS forward proton Time-of-Flight detector in Run 2

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • ATLAS Collaboration
Article numberP05054
<mark>Journal publication date</mark>21/05/2024
<mark>Journal</mark>Journal of Instrumentation
Issue number05
Publication StatusPublished
<mark>Original language</mark>English


We present performance studies of the Time-of-Flight (ToF) subdetector of the ATLAS Forward Proton (AFP) detector at the LHC. Efficiencies and resolutions are measured using high-statistics data samples collected at low and moderate pile-up in 2017, the first year when the detectors were installed on both sides of the interaction region. While low efficiencies are observed, of the order of a few percent, the resolutions of the two ToF detectors measured individually are 21 ps and 28 ps, yielding an expected resolution of the longitudinal position of the interaction, z vtx, in the central ATLAS detector of 5.3 ± 0.6 mm. This is in agreement with the observed width of the distribution of the difference between z vtx, measured independently by the central ATLAS tracker and by the ToF detector, of 6.0 ± 2.0 mm.