A1 Journal article (refereed)
ALICE luminosity determination for Pb–Pb collisions at √sNN = 5.02 TeV (2024)

ALICE Collaboration. (2024). ALICE luminosity determination for Pb–Pb collisions at √sNN = 5.02 TeV. Journal of Instrumentation, 19(2), Article P02039. https://doi.org/10.1088/1748-0221/19/02/P02039

JYU authors or editors

Publication details

All authors or editors: ALICE Collaboration

Journal or series: Journal of Instrumentation

eISSN: 1748-0221

Publication year: 2024

Publication date: 01/02/2024

Volume: 19

Issue number: 2

Article number: P02039

Publisher: IOP Publishing

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1088/1748-0221/19/02/P02039

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/94624

Publication is parallel published: https://arxiv.org/abs/2204.10148

Abstract

Luminosity determination within the ALICE experiment is based on the measurement, in van der Meer scans, of the cross sections for visible processes involving one or more detectors (visible cross sections). In 2015 and 2018, the Large Hadron Collider provided Pb−Pb collisions at a centre-of-mass energy per nucleon pair of √sNN=5.02 TeV. Two visible cross sections, associated with particle detection in the Zero Degree Calorimeter (ZDC) and in the V0 detector, were measured in a van der Meer scan. This article describes the experimental set-up and the analysis procedure, and presents the measurement results. The analysis involves a comprehensive study of beam-related effects and an improved fitting procedure, compared to previous ALICE studies, for the extraction of the visible cross section. The resulting uncertainty of both the ZDC-based and the V0-based luminosity measurement for the full sample is 2.5%. The inelastic cross section for hadronic interactions in Pb−Pb collisions at √sNN=5.02 TeV, obtained by efficiency correction of the V0-based visible cross section, was measured to be 7.67±0.25 b, in agreement with predictions using the Glauber model.

Keywords: particle physics; research equipment; detectors; luminosity

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Ministry reporting: Yes

Reporting Year: 2024

Preliminary JUFO rating: 1