Speaker
Description
Direct photons are a useful probe to study the properties of QGP and the dynamic evolution of the collision system as they do not interact with the medium strongly. Low transverse momentum direct photons are believed to originate primarily from thermal radiation, however, calculations of thermal photon emission fall short in describing the measured direct photon yield and the anisotropy at the same time. The question is tied to the photon production mechanism in heavy ion collisions.
In this poster, more precise measurements of the direct photon momentum spectrum in the range of