# Elliptic Flow Measurement of Direct Photon in sNN=200GeV Au+Au Collisions at RHIC-PHENIX

• Azimuthal anisotropy of direct photon is measured in sNN=200GeV Au+Au collisions at RHIC-PHENIX. Direct photon is one of the most effective probes to study properties of hot dence medium at initial state (also QGP state) of heavy ion collisions because photons almost do not interact strongly with any other particles caused by its long mean free path and they keep their conditions when they are created. Within statistical and systematic errors, the elliptic flow parameter (v2) of direct photon is consistent with zero. Direct photon v2 is estimated by hadron decay photon contamination are subtracted from inclusive photon v2 in intermediate to high transverse momentum (pT) region (0 to 10GeV/c) for 3 centrality selections (20% steps) and minimum bias.
•  [1] . Adler S S et al. Phys. Rev. Lett., 2003, 91: 0723012. Turbide S, Rapp R, Gale C. Phys. Rev., 2004, C69: 0149033. Turbide S et al. Phys. Rev. Lett., 2006, 96: 0323034. Adler S S et al. Phys. Rev. Lett., 2005, 94: 2323015. Adler S S et al. (PHENIX Collaboration). Phys. Rev. Lett.,2006, 96: 0323026. Aphecetche L et al. Nucl. Instrum. Methods, 2003, A499:521

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Kentaro Miki. Elliptic Flow Measurement of Direct Photon in sNN=200GeV Au+Au Collisions at RHIC-PHENIX[J]. Chinese Physics C, 2007, 31(12): 1174-1176.
Kentaro Miki. Elliptic Flow Measurement of Direct Photon in sNN=200GeV Au+Au Collisions at RHIC-PHENIX[J]. Chinese Physics C, 2007, 31(12): 1174-1176.
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###### 通讯作者: 陈斌, bchen63@163.com
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沈阳化工大学材料科学与工程学院 沈阳 110142

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## Elliptic Flow Measurement of Direct Photon in sNN=200GeV Au+Au Collisions at RHIC-PHENIX

###### Corresponding author: Kentaro Miki,
• University of Tsukuba, Tsukuba, Ibaraki 305, Japan

Abstract: Azimuthal anisotropy of direct photon is measured in sNN=200GeV Au+Au collisions at RHIC-PHENIX. Direct photon is one of the most effective probes to study properties of hot dence medium at initial state (also QGP state) of heavy ion collisions because photons almost do not interact strongly with any other particles caused by its long mean free path and they keep their conditions when they are created. Within statistical and systematic errors, the elliptic flow parameter (v2) of direct photon is consistent with zero. Direct photon v2 is estimated by hadron decay photon contamination are subtracted from inclusive photon v2 in intermediate to high transverse momentum (pT) region (0 to 10GeV/c) for 3 centrality selections (20% steps) and minimum bias.

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