Observation of Centrality-Dependent Acoplanarity for Muon Pairs Produced via Two-Photon Scattering in Pb+Pb Collisions at sqrt[s_{NN}]=5.02 TeV with the ATLAS Detector

Phys Rev Lett. 2018 Nov 23;121(21):212301. doi: 10.1103/PhysRevLett.121.212301.