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Electromagnetic probes such as dileptons and photons are useful to investigate the thermodynamical state of the early stages of heavy-ion collisions. The PHENIX experiment has measured both photons and dileptons in p+p, d+Au, and Au+Au collisions. An excess of dilepton yield over the expected hadronic contribution is seen in the mass region 0.2–0.8 GeV/c 2 in Au+Au collisions, most prominently...
Direct photon and photon-jet correlations are perfect tools for tomographic studies of the dense medium produced in heavy ion collisions at LHC energies. Due to their weak interactions with the medium, direct photons serve as standard candles for hard-scattering processes, providing a clean calibration of the momentum of the associated jets. The ATLAS detector has powerful opportunities to carry out...
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