Systematic studies of the centrality dependence of soft photon production in Au+Au collision with PHENIX

Abstract

Since the earliest days of Heavy Ion Physics thermal soft photon radiation emitted during the reaction had been theorized as a smoking gun signal for formation of a quark-gluon plasma and as a tool to characterize its properties. In recent years the existence of excess photon radiation in heavy ion collisions over the expectation from initial hard interactions has been confirmed at both RHIC and LHC energies by PHENIX and ALICE respectively. There the radiation has been found to exhibit elliptic flow $v_2$ well above what can currently be reconciled with a picture of early emission from a plasma phase. During the 2007 and 2010 Au+Au runs PHENIX has measured a high purity sample of soft photons down to $p_T>0.4\text{GeV}/c$ using an external conversion method. We present recent systematic studies by PHENIX from that sample on the centrality dependence of the soft photon yield, and elliptic and triangular flow $v_2$ and $v_3$ in Au+Au collisions which fill in the experimental picture and enable discrimination of competing soft photon production scenarios.

arXiv comment4 pages, 3 figures, QM2014 proceedings

References in corpus (4)

• Methods for analyzing anisotropic flow in relativistic nuclear collisions
• Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature
• Observation of direct-photon collective flow in sqrt(s_NN)=200 GeV Au+Au collisions
• Design, Construction, Operation and Performance of a Hadron Blind Detector for the PHENIX Experiment

Cited by in corpus (6)

• The production of photons in relativistic heavy-ion collisions
• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• Hadronic and partonic sources of direct photons in relativistic heavy-ion collisions
• Chiral transition in the probe approximation from an Einstein-Maxwell-dilaton gravity model
• Thermal photon radiation in high multiplicity p+Pb collisions at the Large Hadron Collider
• Effects of Intense Magnetic Fields, High Temperature and Density on QCD-Related Phenomena