Observation of Centrality-Dependent Acoplanarity for Muon Pairs Produced via Two-Photon Scattering in Pb+Pb Collisions at sNN =5.02 TeV with the ATLAS Detector

Morad Aaboud,Georges Aad,Brad Abbott,Ovsat Abdinov,Baptiste Abeloos,Deshan Kavishka Abhayasinghe,Syed Haider Abidi,Ossama AbouZeid,Nicola Abraham,Halina Abramowicz,Henso Abreu,Yiming Abulaiti,Bobby Samir Acharya,Shunsuke Adachi,Leszek Adamczyk,Jahred Adelman, Michael Adersberger,Aytul Adiguzel,Tim Adye,A. A. Affolder,Yoav Afik,Catalin Agheorghiesei,J. A. Aguilar-Saavedra,Faig Ahmadov,Giulio Aielli,Shunichi Akatsuka,T. P. A. Åkesson, Ece Akilli, A. V. Akimov,Gian Luigi Alberghi,J. Albert,Pietro Albicocco,M. J. Alconada Verzini,Sara Alderweireldt,Martin Aleksa,Igor Aleksandrov,Calin Alexa,Theodoros Alexopoulos,Muhammad Alhroob,Babar Ali,Gianluca Alimonti, John Alison, Steven Patrick Alkire,Corentin Allaire, Bmm Allbrooke, Benjamin William Allen,Philip Patrick Allport,Alberto Aloisio,Alejandro Alonso,Francisco Alonso,Cristiano Alpigiani,Azzah Aziz Alshehri, Mahmoud Alstaty,B. Alvarez Gonzalez,D. Álvarez Piqueras,M. G. Alviggi,Brian Thomas Amadio,Y. Amaral Coutinho,Luca Ambroz,Christoph Amelung, D. Amidei,S. P. Amor Dos Santos,Simone Amoroso,Cherifa Sabrina Amrouche,Christos Anastopoulos, Lucian Stefan Ancu,Nansi Andari,Timothy Andeen,Christoph Falk Anders,John Kenneth Anders,K. J. Anderson,A. Andreazza,V. Andrei,Christopher Anelli,Stylianos Angelidakis, Ivan Angelozzi,Aaron Angerami,Alexey Anisenkov,Alberto Annovi,Claire Antel, Matthew Thomas Anthony,Massimo Antonelli, D. J. A. Antrim, F. Anulli,Masato Aoki,J. A. Aparisi Pozo,L. Aperio Bella,Giorgi Arabidze,Juan Pedro Araque,V. Araujo Ferraz,R. Araujo Pereira, A. T. H. Arce,Rose Elisabeth Ardell,Francisco Anuar Arduh,J-F. Arguin,S. Argyropoulos, Aaron James Armbruster,Lewis James Armitage,Alexander Armstrong

Physical Review Letters（2018）

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摘要

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.

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