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作者机构:Univ Jyvaskyla Dept Phys FI-40014 Jyvaskyla Finland
出 版 物:《Physical Review C》 (物理学评论C辑:核物理学)
年 卷 期:2007年第76卷第6期
页 面:064905-064905页
核心收录:
学科分类:07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学]
主 题:QUARK-GLUON PLASMA FRAGMENTATION FUNCTIONS HADRON SPECTRA COLLISIONS PARTONS NUCLEI
摘 要:The unexpectedly strong suppression of high pT heavy quarks in heavy-ion collisions has given rise to the idea that partons propagating through a medium in addition to energy loss by induced radiation also undergo substantial energy loss due to elastic collisions. However, the precise magnitude of this elastic energy-loss component is highly controversial. Although for a parton inside a medium it is surprisingly difficult to define the difference between elastic and radiative processes rigorously, the main phenomenological difference is in the dependence of energy loss on in-medium path length: in a constant medium radiative energy loss is expected to grow quadratically with path length, elastic energy loss linearly. In this article, we investigate a class of energy-loss models with such a linear path-length dependence and demonstrate that they are incompatible with measured data on hard hadronic back-to-back correlations where a substantial variation of path length is probed. This indicates that any elastic energy-loss component has to be small.