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Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector

2018-11-20Journal article Open access
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dc.contributor.authorATLAS collaboration (2913 authors)
dc.contributor.authorAguilar Saavedra, Juan Antonio
dc.contributor.authorAmor Dos Santos, Susana Patricia
dc.contributor.authorAraque Espinosa, Juan Pedro
dc.contributor.authorCastro, Nuno Filipe
dc.contributor.authorConde Muino, Patricia
dc.contributor.authorDa Cunha Sargedas De Sousa, Mario Jose
dc.contributor.authorDias do vale, Tiago
dc.contributor.authorFaisca Rodrigues Pereira, Rui Miguel
dc.contributor.authorFiolhais, Miguel
dc.contributor.authorGalhardo, Bruno
dc.contributor.authorGomes, Agostinho
dc.contributor.authorGoncalo, Ricardo
dc.contributor.authorJorge, Pedro
dc.contributor.authorMachado Miguens, Joana
dc.contributor.authorMaio, Amelia
dc.contributor.authorManeira, Jose
dc.contributor.authorMendes Gouveia, Emanuel Demetrio
dc.contributor.authorOleiro Seabra, Luis Filipe
dc.contributor.authorOnofre, Antonio
dc.contributor.authorCosta Batalha Pedro, Rute
dc.contributor.authorPereira Peixoto, Ana Paula
dc.contributor.authorSantos, Helena
dc.contributor.authorSaraiva, Joao
dc.contributor.authorSilva, Jose Manuel
dc.contributor.authorTavares Delgado, Ademar
dc.contributor.authorVeloso, Filipe
dc.contributor.authorWolters, Helmut
dc.date.accessioned2019-02-05T16:36:21Z
dc.date.available2019-02-05T16:36:21Z
dc.date.issued2018-11-20
dc.date.updated2019-02-05T16:36:21Z
dc.description.abstractThis Letter presents a measurement of γγ→μ+μ- production in Pb+Pb collisions recorded by the ATLAS detector at the Large Hadron Collider at sNN=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.
dc.description.versionPeer Reviewed
dc.identifierPhys.Rev.Lett. 121 (2018) 212301; DOI 10.1103/PhysRevLett.121.212301
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.121.212301
dc.identifier.urihttp://hdl.handle.net/10400.26/27671
dc.language.isoeng
dc.titleObservation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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