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University of Illinois, Chicago, IL 61801, USA.
Phys Rev Lett. 2007 May 11;98(19):192301. doi: 10.1103/PhysRevLett.98.192301. Epub 2007 May 10.
The STAR collaboration at the BNL Relativistic Heavy-Ion Collider (RHIC) reports measurements of the inclusive yield of nonphotonic electrons, which arise dominantly from semileptonic decays of heavy flavor mesons, over a broad range of transverse momenta (1.2<p(T)<10 GeV/c) in p+p, d+Au, and Au+Au collisions at sqrt[s_{NN}]=200 GeV. The nonphotonic electron yield exhibits an unexpectedly large suppression in central Au+Au collisions at high p(T), suggesting substantial heavy-quark energy loss at RHIC. The centrality and p(T) dependences of the suppression provide constraints on theoretical models of suppression.
布鲁克海文国家实验室相对论重离子对撞机（RHIC）上的STAR合作组报告了在质心能量√[sNN]=200 GeV的质子-质子（p+p）、氘核-金核（d+Au）和金核-金核（Au+Au）碰撞中，非光子电子的包容性产额的测量结果，这些非光子电子主要来自重味介子的半轻子衰变，横动量范围较宽（1.2 < pT < 10 GeV/c）。在高横动量下，中心Au+Au碰撞中的非光子电子产额出现了意外的大幅压低，这表明在RHIC中有大量的重夸克能量损失。这种压低的中心度和横动量依赖性为压低的理论模型提供了限制。
