原子核中快夸克的能量损失
Energy loss of fast quarks in nuclei.
作者信息
Johnson M B, Kopeliovich B Z, Potashnikova I K, McGaughey P L, Moss J M, Peng J C, Garvey G T, Leitch M J, Adams M R, Alde D M, Baer H W, Barlett M L, Brown C N, Cooper W E, Carey T A, Danner G, Hoffmann G W, Hsiung Y B, Kaplan D M, Klein A, Lee C, Lillberg J W, McCarthy R L, Mishra C S, Wang M J
机构信息
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
出版信息
Phys Rev Lett. 2001 May 14;86(20):4483-7. doi: 10.1103/PhysRevLett.86.4483.
We report an analysis of the nuclear dependence of the yield of Drell-Yan dimuons from the 800 GeV/c proton bombardment of 2H, C, Ca, Fe, and W targets. Employing a new formulation of the Drell-Yan process in the rest frame of the nucleus, this analysis examines the effect of initial-state energy loss and shadowing on the nuclear-dependence ratios versus the incident proton's momentum fraction and dimuon effective mass. The resulting energy loss per unit path length is -dE/dz = 2.32+/-0.52+/-0.5 GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in a nuclear environment.
我们报告了对800 GeV/c质子轰击2H、C、Ca、Fe和W靶产生的Drell-Yan双μ子产率的核依赖性分析。在原子核的静止参考系中采用Drell-Yan过程的新公式，该分析研究了初始态能量损失和遮蔽对核依赖性比率与入射质子动量分数和双μ子有效质量的影响。得到的单位路径长度能量损失为-dE/dz = 2.32±0.52±0.5 GeV/fm。这是首次观测到在核环境中传播的部分子存在非零能量损失。
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