https://doi.org/10.1051/epjconf/202429607007
Measurement of low-pT direct-photons with PHENIX
Stony Brook University, Stony Brook, NY 11790, USA
* e-mail: vassu.doomra@stonybrook.edu
Published online: 26 June 2024
Photons provide snapshots of the evolution of relativistic heavy-ion collisions as they are emitted at all stages and do not interact with the medium strongly. With RHIC, measurements of low momentum direct-photons are made possible across different system sizes and beam energies. An excess of direct-photons, above the prompt photon production from hard scattering processes, is observed for a system size corresponding to dNch/dη of 20-30, with a large azimuthal anisotropy and a characteristic dependence on collision centrality. In addition to the results for direct-photon spectra, azimuthal anisotropies of direct-photons in Au+Au collisions at √SNN = 200 GeV are also discussed, thereby, shedding light on the long-standing direct-photon puzzle.
© The Authors, published by EDP Sciences, 2024
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.
