Transverse-momentum spectra in Au plus Au and d plus Au collisions at √sNN=200 GeV and the pseudorapidity dependence of high-pT suppression
Transverse-momentum spectra in Au plus Au and d plus Au collisions at √sNN=200 GeV and the pseudorapidity dependence of high-pT suppression
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DOI：
10.1103/physrevlett.91.072305
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发表时间：
2003-08-15
影响因子：
8.6
通讯作者：
Zgura, IS
中科院分区：
文献类型：
--
作者：
Arsene, I;Bearden, IG;Zgura, IS
我们展示了在 RHIC 上通过 BRAHMS 实验测量的根 (NN)=200 GeV 处 Au+Au 和 d+Au 碰撞的带电强子光谱。将不同碰撞中心性的光谱与相同能量下的 p+(p) 条形碰撞的光谱进行比较，并按二元碰撞的数量进行缩放。 eta=0 和 eta=2.2 时中心 Au+Au 碰撞的所得比率（核修饰因子）证明高 p(T) 区域 (>2 GeV/c) 存在强烈抑制。相反，d+Au 核修饰因子（eta=0）表现出高 p(T) 产率的增强。这些测量表明中心 Au+Au 碰撞产生的介质中高 p(T) 粒子的高能量损失。 d+Au 碰撞中缺乏抑制使得初始态效应不太可能解释中心 Au+Au 碰撞中的抑制。
We present spectra of charged hadrons from Au+Au and d+Au collisions at roots(NN)=200 GeV measured with the BRAHMS experiment at RHIC. The spectra for different collision centralities are compared to spectra from p+(p) over bar collisions at the same energy scaled by the number of binary collisions. The resulting ratios (nuclear modification factors) for central Au+Au collisions at eta=0 and eta=2.2 evidence a strong suppression in the high p(T) region (>2 GeV/c). In contrast, the d+Au nuclear modification factor (at eta=0) exhibits an enhancement of the high p(T) yields. These measurements indicate a high energy loss of the high p(T) particles in the medium created in the central Au+Au collisions. The lack of suppression in d+Au collisions makes it unlikely that initial state effects can explain the suppression in the central Au+Au collisions.