Electromagnetic processes, both photon-photon and photon-nucleus, are shown to be useful in studying aspects of QED, QCD, and potentially the QGP. Using lead-lead collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, the ATLAS detector has performed measurements of exclusive dimuon production, light-by-light scattering (via exclusive diphoton production), and photo-nuclear dijet production. These are all important examples of ultraperipheral collisions, where the nuclei do not interact hadronically. A recent study of the opening angles of dimuons produced in hadronic heavy-ion collisions, after subtracting heavy-flavor backgrounds, demonstrates that the dimuons carry information correlated with the overlap geometry, potentially about the density of charges in the QGP itself.
Volume 345 -
International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2018) -
Electroweak Probes
Electromagnetic processes with quasireal photonsin Pb+Pb collisions: QED, QCD, and the QGP
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Pre-published on:
January 14, 2019
Published on:
April 24, 2019
Abstract
DOI: https://doi.org/10.22323/1.345.0187
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