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arXiv 2209.15433hep-ph
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$g\to c \bar{c}$分裂的介质修饰

Medium-modifications of $g\to c \bar{c}$ splitting

Sohyun Park

摘要:

我们研究了胶子分裂成夸克和反夸克对的介质修正。应用Baier-Dokshitzer-Mueller-Peigné-Schiff和Zakharov(BDMPS-Z)方法,导出了介质中$g\to q \bar{q}$分裂函数在近程函极限下的路径积分公式.我们的分析表明,有两个性质不同的介质效应:横向动量加宽的$q \bar{q}$对和增强生产这样的对。我们注意到,如果从介质到部分子的平均动量转移是在夸克质量尺度上,这两种效应在数值上都是相当大的。在超相对论重离子碰撞中,这一条件是通过粲夸克实现的,因此我们的数值分析主要集中在$g\to c \bar{c}$分裂的介质修正上。

英文摘要:

We study medium-modifications of the gluon splitting into a quark and anti-quark pair. Applying the Baier-Dokshitzer-Mueller-Peigné-Schiff and Zakharov (BDMPS-Z) formalism, we derive a path-integral formula for the in-medium $g\to q \bar{q}$ splitting function in the close-to-eikonal limit. Our analysis shows that there are two qualitatively different medium effects: transverse momentum broadening of $q \bar{q}$ pairs and enhanced production of such pairs. We note that both effects are numerically sizeable if the average momentum transfer from the medium to the parton is at the quark mass scale. In ultra-relativistic heavy-ion collisions, this condition is realized by charm quarks, therefore we focus our numerical analysis on the medium-modifications of $g\to c \bar{c}$ splitting.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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