Luminositydeterminationwithinthe ALICEexperimentis based on themeasurement, in van der Meer scans, of the cross sections for visible processes involving one or more detectors (visiblecrosssections). In2015and2018,theLargeHadronColliderprovidedPb–Pbcollisionsat acentre-of-massenergypernucleonpairof√𝑠NN =5.02 TeV.Twovisiblecrosssections,associated withparticledetectionintheZeroDegreeCalorimeter(ZDC)andintheV0detector,weremeasured in a van der Meer scan. This article describes the experimental set-up and the analysis procedure, andpresentsthemeasurementresults. Theanalysisinvolvesacomprehensivestudyofbeam-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- basedvisiblecrosssection,wasmeasuredtobe7.67±0.25b,inagreementwithpredictionsusing the Glaubermodel.

ALICE luminosity determination for Pb–Pb collisions at √s NN = 5.02 TeV

Camerini, P.;Contin, G.;De Martin, C.;Fragiacomo, E.;Luparello, G.;Margagliotti, G. V.;Piano, S.;Rui, R.;Urioni, M.;Zaccolo, V.;
2024-01-01

Abstract

Luminositydeterminationwithinthe ALICEexperimentis based on themeasurement, in van der Meer scans, of the cross sections for visible processes involving one or more detectors (visiblecrosssections). In2015and2018,theLargeHadronColliderprovidedPb–Pbcollisionsat acentre-of-massenergypernucleonpairof√𝑠NN =5.02 TeV.Twovisiblecrosssections,associated withparticledetectionintheZeroDegreeCalorimeter(ZDC)andintheV0detector,weremeasured in a van der Meer scan. This article describes the experimental set-up and the analysis procedure, andpresentsthemeasurementresults. Theanalysisinvolvesacomprehensivestudyofbeam-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- basedvisiblecrosssection,wasmeasuredtobe7.67±0.25b,inagreementwithpredictionsusing the Glaubermodel.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3094218
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