"cfs" of "Suppression of away-side jet fragments with respect to the reaction plane in Au+Au collisions at sqrt(s_NN) = 200 GeV"

BNL-RHIC. Pair correlations between large transverse momentum neutral pion triggers (pT= 4–7 GeV/c) andcharged hadron partners (pT= 3–7 GeV/c) in central (0–20%) and midcentral (20–60%) Au+Aucollisions are presented as a function of trigger orientation with respect to the reaction plane. Theparticles are at larger momentum than where jet shape modifications have been observed, and thecorrelations are sensitive to the energy loss of partons traveling through hot dense matter. An out-of-plane trigger particle produces only 26±20% of the away-side pairs that are observed opposite ofan in-plane trigger particle. In contrast, near-side jet fragments are consistent with no suppressionor dependence on trigger orientation with respect to the reaction plane. These observations arequalitatively consistent with a picture of little near-side parton energy loss either due to surface biasor fluctuations and increased away-side parton energy loss due to a long path through the medium.The away-side suppression as a function of reaction-plane angle is shown to be sensitive to both theenergy loss mechanism in and the space-time evolution of heavy-ion collisions. - {location: "https://www.phenix.bnl.gov/phenix/WWW/info/data/ppg116_data.html", description: "web page with data point"}

BNL-RHIC（布鲁克海文国家实验室-相对论重离子对撞机）实验中，本工作报道了中心度0~20%与20~60%的金-金（Au+Au）碰撞内，大横动量中性π介子触发粒子（横向动量$p_ ext{T}=4sim7 ext{GeV}/c$）与带电强子关联粒子（横向动量$p_ ext{T}=3sim7 ext{GeV}/c$）的成对关联分布，关联结果随触发粒子相对于反应平面的方位角变化。

所涉粒子的动量区间高于已观测到喷注形状修改的动量范围，该成对关联对穿过热密介质的部分子能量损失具有显著敏感性。相较于面内触发粒子对应观测到的背侧粒子对，面外触发粒子仅能产生其26±20%的信号强度。与之相对，近侧喷注碎片的产额未表现出抑制效应，亦与触发粒子相对于反应平面的方位角无依赖关系。

上述观测结果与下述物理图像定性一致：受表面偏倚或涨落效应影响，近侧部分子的能量损失极小；而背侧部分子因穿过热密介质的路径更长，其能量损失显著增强。背侧信号抑制随反应平面方位角的变化关系，既对重离子碰撞中的部分子能量损失机制敏感，也对碰撞的时空演化过程具有敏感性。

- {"来源链接": "https://www.phenix.bnl.gov/phenix/WWW/info/data/ppg116_data.html", "数据说明": "包含实验数据点的网页"}