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Exclusive dielectron production in ultraperipheral Pb+Pb collisions at √sNN=5.02 TeV with ATLAS
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-9766-2670
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-7489-9184
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-3380-8167
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Number of Authors: 29132023 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2023, no 6, article id 182Article in journal (Refereed) Published
Abstract [en]

Exclusive production of dielectron pairs, γγ → e+e, is studied using = 1.72 nb−1 of data from ultraperipheral collisions of lead nuclei at √sNN = 5.02 TeV recorded by the ATLAS detector at the LHC. The process of interest proceeds via photon–photon interactions in the strong electromagnetic fields of relativistic lead nuclei. Dielectron production is measured in the fiducial region defined by following requirements: electron transverse momentum > 2.5 GeV, absolute electron pseudorapidity |ηe| < 2.5, dielectron invariant mass mee > 5 GeV, and dielectron transverse momentum < 2 GeV. Differential cross-sections are measured as a function of mee, average , absolute dielectron rapidity |yee|, and scattering angle in the dielectron rest frame, |cos θ*|, in the inclusive sample, and also with a requirement of no activity in the forward direction. The total integrated fiducial cross-section is measured to be 215±1(stat.)(syst.)±4(lumi.) μb. Within experimental uncertainties the measured integrated cross-section is in good agreement with the QED predictions from the Monte Carlo programs STARLIGHT and SUPERCHIC, confirming the broad features of the initial photon fluxes. The differential cross-sections show systematic differences from these predictions which are more pronounced at high |yee| and |cos θ*| values.

Place, publisher, year, edition, pages
2023. Vol. 2023, no 6, article id 182
Keywords [en]
Heavy Ion Experiments, Heavy-Ion Collision
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-223712DOI: 10.1007/JHEP06(2023)182ISI: 001069745300005Scopus ID: 2-s2.0-85163887123OAI: oai:DiVA.org:su-223712DiVA, id: diva2:1815598
Available from: 2023-11-29 Created: 2023-11-29 Last updated: 2023-11-29Bibliographically approved

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLou, XuanhongMilstead, David A.Moa, TorbjörnPasuwan, PatrawanPereira Sanchez, LauraRichter, StefanShaikh, Nabila W.Silverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLou, XuanhongMilstead, David A.Moa, TorbjörnPasuwan, PatrawanPereira Sanchez, LauraRichter, StefanShaikh, Nabila W.Silverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Subatomic Physics

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