Electromagnetic emission from hot medium measured by the PHENIX   experiment at RHIC
  Electromagnetic radiation has been of interest in heavy ion collisions because they shed light on early stages of the collisions where hadronic probes do not provide direct information since hadronization and hadronic interactions occur later. The latest results on photon measurement from the PHENIX experiment at RHIC reflect thermodynamic properties of the matter produced in the heavy ion collisions. An unexpectedly large positive elliptic flow measured for direct photons can not be explained by any of the current models. 
Takao Sakaguchi (for the PHENIX Collaboration)
nucl-ex hep-ex nucl-th