Observation of Centrality-Depen<i>dent</i> Acoplanarity for Muon Pairs Produced via Two-Photon Scattering in Pb plus Pb Collisions at √<i>s<sub>NN</sub></i>=5.02 TeV with the ATLAS Detector<i> </i>



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2895 more authors) (2018) Observation of Centrality-Depen<i>dent</i> Acoplanarity for Muon Pairs Produced via Two-Photon Scattering in Pb plus Pb Collisions at √<i>s<sub>NN</sub></i>=5.02 TeV with the ATLAS Detector<i> </i>. PHYSICAL REVIEW LETTERS, 121 (21). 212301-.

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Abstract

This Letter presents a measurement of γγ→μ^{+}μ^{-} production in Pb+Pb collisions recorded by the ATLAS detector at the Large Hadron Collider at sqrt[s_{NN}]=5.02  TeV with an integrated luminosity of 0.49  nb^{-1}. The azimuthal angle and transverse momentum correlations between the muons are measured as a function of collision centrality. The muon pairs are produced from γγ through the interaction of the large electromagnetic fields of the nuclei. The contribution from background sources of muon pairs is removed using a template fit method. In peripheral collisions, the muons exhibit a strong back-to-back correlation consistent with previous measurements of muon pair production in ultraperipheral collisions. The angular correlations are observed to broaden significantly in central collisions. The modifications are qualitatively consistent with rescattering of the muons while passing through the hot matter produced in the collision.

Item Type: Article
Additional Information: 29 pages total, author list starting on page 13, 4 figures, 1 table, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2018-11
Uncontrolled Keywords: ATLAS Collaboration, ATLAS Collaboration, ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 31 May 2019 08:13
Last Modified: 14 Oct 2023 09:38
DOI: 10.1103/PhysRevLett.121.212301
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3043672

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