Global extraction of the jet transport coefficient in cold nuclear matter
Global extraction of the jet transport coefficient in cold nuclear matter
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DOI：
10.1103/physrevd.103.l031901
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
P. Ru;Z. Kang;E. Wang;H. Xing;Ben-Wei Zhang
中科院分区：
文献类型：
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作者：
P. Ru;Z. Kang;E. Wang;H. Xing;Ben-Wei Zhang
在广义QCD因式分解的框架下，我们首次对冷核物质的喷流输运系数进行了全局分析。该分析考虑了半包容电子-核深度非弹性散射的横向动量展宽、质子-核碰撞的Drell-yan双轻子和重夸克产生的世界数据，以及深度非弹性散射中结构函数的核修正，共包括8个数据集的215个数据点。我们首次定量地阐明了核介质性质的普适性和探测尺度依赖关系。我们预计，冷核物质中确定的Q参数将对精确识别重离子碰撞中产生的热致密介质的输运性质产生重大影响。
Within the framework of the generalized QCD factorization formalism, we perform the first global analysis of the jet transport coefficient ($\hat q$) for cold nuclear matter. The analysis takes into account the world data on transverse momentum broadening in semi-inclusive electron-nucleus deep inelastic scattering, Drell-Yan dilepton and heavy quarkonium production in proton-nucleus collisions, as well as the nuclear modification of the structure functions in deep inelastic scattering, comprising a total of 215 data points from 8 data sets. For the first time, we clarify quantitatively the universality and probing scale dependence of the nuclear medium property as encoded in $\hat q$. We expect that the determined parametrization of $\hat q$ in cold nuclear matter will have significant impact on precise identification of the transport property of hot dense medium created in heavy ion collisions.