Azimuthal anisotropy measurement of direct photon in root(NN)-N-S=200 GeV Au+Au collisions at RHIC-PHENIX

作者：Miki Kentaro^*

来源：International Journal of Modern Physics E-Nuclear Physics, 2007, 16(7-8): 2160-2165.

DOI：10.1142/S0218301307007623

Azimuthal anisotropy of direct photons is measured in root(NN)-N-S = 200 GeV Au + Au collisions by the PHENIX experiment at RHIC. Direct photons are one of the most effective probes to study properties of hot dense medium at initial state (also QGP state) of heavy ion collisions because photons do not interact strongly with medium once produced. They keep their conditions when they are created. Within statistical and systematic errors, the elliptic flow parameter (v(2)) of direct photons is consistent with zero. Direct photons v(2) is measured by the hadron decay photon background v(2) from inclusive photon v(2) in intermediate to high transverse momentum (p(T)) region (0 to 10 GeV/c) for 3 centrality selections (20% steps) and minimum bias.

• 出版日期2007-9