Publication: Electromagnetic processes with quasireal photons in Pb plus Pb collisions: QED, QCD, and the QGP
Дата
2019
Авторы
Steinberg, P.
Aaboud, M.
Aad, G.
Abbott, B.
Belotskiy, K.
Belyaev, N. L.
Bulekov, O.
Kantserov, V. A.
Ponomarenko, D.
Proklova, N.
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Аннотация
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 root s(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.
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Electromagnetic processes with quasireal photons in Pb plus Pb collisions: QED, QCD, and the QGP / Steinberg, P [et al.] // NUCLEAR PHYSICS A. - 2019. - 982. - P. 259-262. - 10.1016/j.nuclphysa.2018.10.087