"Figure 2a(AuAu)" of "Jet-Hadron Correlations in sqrt{s_{NN}} = 200 GeV Au+Au and p+p Collisions"

BNL-RHIC. Azimuthal angular correlations of charged hadrons with respect to the axis of a reconstructed (trigger) jet in Au+Au and p+p collisions at sNN−−−sqrt=200GeV in STAR are presented. The trigger jet population in Au+Au collisions is biased towards 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 (passocT) and enhanced at low passocT 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.

本数据集呈现了布鲁克海文国家实验室相对论重离子对撞机（BNL-RHIC）上螺旋径迹探测器（STAR）的实验结果：在质心系能量√s_NN=200 GeV的金金碰撞（Au+Au）与质子质子碰撞（p+p）中，带电强子（charged hadrons）相对于重建（触发）喷注轴线的方位角关联（azimuthal angular correlations）。金金碰撞中的触发喷注样本（trigger jet population）偏向未与介质（medium）发生相互作用的喷注，这使得金金碰撞与质子质子碰撞间的喷注能量匹配更为简便，同时强化了介质对反冲喷注（recoil jet）的影响。与质子质子碰撞相比，在0-20%中心度的金金碰撞中，反冲喷注的关联强子产额（associated hadron yield）在高横向动量（transverse momentum）下被显著抑制，而在低关联粒子横向动量（p_assoc_T）下则被增强，这一现象指示超相对论重离子碰撞（ultrarelativistic heavy-ion collisions）中存在介质诱导的部分子能量损失（medium-induced parton energy loss）。