AGH University of Science and Technology, Cracow, Poland.
University of Kentucky, Lexington, Kentucky 40506-0055, USA.
Phys Rev Lett. 2014 Mar 28;112(12):122301. doi: 10.1103/PhysRevLett.112.122301.
Azimuthal angular correlations of charged hadrons with respect to the axis of a reconstructed (trigger) jet in Au+Au and p+p collisions at √[s(NN)]=200 GeV in STAR are presented. The trigger jet population in Au+Au collisions is biased toward jets that have not interacted with the medium, allowing easier matching of jet energies between Au+Au and p+p collisions while enhancing medium effects on the recoil jet. The associated hadron yield of the recoil jet is significantly suppressed at high transverse momentum (pTassoc) and enhanced at low pTassoc in 0%-20% central Au+Au collisions compared to p+p collisions, which is indicative of medium-induced parton energy loss in ultrarelativistic heavy-ion collisions.
STAR 实验在质心系能量为 √[s(NN)]=200 GeV 的 Au+Au 和 p+p 对撞中，呈现了与重建（触发）喷注轴成角关联的带电强子。在 Au+Au 碰撞中，触发喷注的选择存在偏倚，偏向于那些没有与介质相互作用的喷注，这使得 Au+Au 和 p+p 碰撞之间的喷注能量匹配更容易，同时增强了介质对反冲喷注的影响。在 0%-20%中心 Au+Au 碰撞中，与 p+p 碰撞相比，反冲喷注的关联强子产额在高横动量（pTassoc）下显著压低，在低 pTassoc 下增强，这表明在相对论重离子碰撞中介质诱导了部分子能量损失。
