ATLAS Experiment probes the quark-gluon plasma in a new study of photo-produced muon pairs
(PHYSorg.com Physics)

At the Large Hadron Collider (LHC) at CERN, the electromagnetic fields of Lorentz-contracted lead nuclei in heavy-ion collisions act as intense sources of high-energy photons, or particles of light. This environment allows particle physicists to study photon-induced scattering processes, which can not be studied elsewhere.