Difficulty of extracting energy loss probability distributions from RAA

作     者：Thorsten Renk 

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：2008年第77卷第1期

页      面：017901-017901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：FRAGMENTATION FUNCTIONS NUCLEI QUARKS QCD 

摘      要：The nuclear suppression of high transverse momentum PT hadrons is one of the most striking findings in heavy-ion collision experiments. It has long been recognized that the suppression can be theoretically described by folding the primary parton spectrum with an energy loss probability distribution which is suitably averaged over the collision geometry. However, an interesting problem is to what degree the procedure can be inverted, i.e., given a measurement of the suppression factor RAA with arbitrary precision, can the probability distribution of energy loss be extracted in a model-independent way? In this Brief Report, we present a conceptual study of the inversion problem for LHC energies and demonstrate that a measurement of RAA alone is insufficient to determine the distribution, other observables such as γ-hadron correlations must be taken into account.