在RHIC-PHENIX中(s_(NN))^(1/2)=200GeV Au+Au碰撞中直接光子的椭圆流测量(英文)  

Elliptic Flow Measurement of Direct Photon in(S_(NN))^(1/2)=200GeV Au+Au Collisions at RHIC-PHENIX

作　　者：Kentaro Miki 

机构地区：[1]for the PHENIX Collaboration University of Tsukuba Tsukuba,Ibaraki 305,Japan

出　　处：《高能物理与核物理》2007年第12期1174-1176,共3页High Energy Physics and Nuclear Physics

摘　　要：Azimuthal anisotropy of direct photon is measured in S_(NN)^(1/2)=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 axe created.Within statistical and systematic errors,the elliptic flow parameter(v_2)of direct photon is consistent with zero. Direct photon v_2 is estimated by hadron decay photon contamination are subtracted from inclusive photon v_2 in intermediate to high transverse momentum(p_T)region(0 to 10GeV/c)for 3 centrality selections(20% steps)and minimum bias.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.

关 键 词：椭圆流 热密集物质 金 离子碰撞 RHIC 光子 

分 类 号：O572.21[理学—粒子物理与原子核物理]