| Issue |
EPJ Web Conf.
Volume 364, 2026
XXXI International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions “Quark Matter 2025”
|
|
|---|---|---|
| Article Number | 01022 | |
| Number of page(s) | 7 | |
| Section | Plenary Sessions | |
| DOI | https://doi.org/10.1051/epjconf/202636401022 | |
| Published online | 17 April 2026 | |
https://doi.org/10.1051/epjconf/202636401022
Experimental overview of electromagnetic radiation in heavy-ion collisions*
CERN, Geneva, Switzerland
** e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published online: 17 April 2026
Abstract
Electromagnetic (EM) probes such as photons and dileptons provide direct insight into the space-time evolution of the hot and dense matter formed in heavy-ion collisions. Being unaffected by strong interactions, they serve as penetrating messengers from all collision stages, from pre-equilibrium dynamics to the quark-gluon plasma (QGP) and hadronic phases. This contribution summarises recent experimental results on direct-photon and dilepton production from RHIC and LHC experiments, as well as at lower energies. Particular emphasis is given to the ongoing 'direct-photon puzzle', the study of universal scaling of direct-photon production over a large range of collision systems and energies. Recent dielectron measurements from ALICE, STAR, and HADES, as well as new experimental developments at the LHC, are presented, along with perspectives for future facilities.
Invited plenary talk at the 31st International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 2025), Frankfurt, Germany, Apr 6-12, 2025.
© The Authors, published by EDP Sciences, 2026
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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