Photons at PHENIX
Baldo Sahlmueller (for the PHENIX collaboration)

TL;DR
This paper reports on measurements of direct photons in heavy-ion collisions at PHENIX, revealing insights into the hot medium and initial processes, with new findings on low pT photon excess and azimuthal anisotropy.
Contribution
It presents the first measurement of low pT direct photon excess via internal conversion and analyzes azimuthal anisotropy in heavy-ion collisions at PHENIX.
Findings
Observed low pT direct photon excess in Au+Au collisions.
Measured azimuthal anisotropy parameter v2 for direct photons.
Provided baseline p+p data for comparison and model testing.
Abstract
Direct photons are a powerful probe to study the properties of the unique matter created in ultrarelativistic heavy-ion collisions. They carry information on the various stages of a heavy-ion collision. At different transverse momenta (pT), different production processes dominate the direct photon yield in heavy-ion collisions. Photons at high pT can be used to study initial hard scattering processes while photons at low and intermediate pT provide direct information on the hot and dense medium created in such collisions since they origin predominantly from jet-medium interactions and from thermal radiation from the medium itself. PHENIX has measured direct-photon yields over a broad pT and energy range in different collision systems such as Au+Au and Cu+Cu, allowing systematic studies of the behavior of direct photons in heavy-ion collisions. Two different methods have been used to…
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Taxonomy
TopicsHigh-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions · Stochastic processes and statistical mechanics
