Langevin dynamics of heavy quarks in a soft-hard factorized approach

Langevin dynamics of heavy quarks in a soft-hard factorized approach
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软硬分解方法中重夸克的朗之万动力学

DOI:
10.1140/epjc/s10052-021-09339-7
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发表时间:
2021-06
期刊:
Eur. Phys. J. C
影响因子:
--
通讯作者:
Wei Xiong
Wei Xiong
中科院分区:
其他
文献类型:
--
作者:
Shuang Li;Fei Sun;Wei Xie;Wei Xiong

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利用软硬因子化模型,结合软散射的热微扰描述和硬碰撞的微扰QCD计算,研究了Langevin动力学中重夸克扩散系数的能量和温度依赖性.通过综合模型-数据比较确定可调参数。我们发现,一个小的值的空间扩散系数在转变温度是首选的数据。利用参数优化模型,我们可以同时描述和TeV的Pb-Pb碰撞中GeV的碰撞和数据。我们还对未来低动量区的实验测试中的非介子进行了预测。
By utilizing a soft-hard factorized model, which combines a thermal perturbative description of soft scatterings and a perturbative QCD-based calculation for hard collisions, we study the energy and temperature dependence of the heavy quark diffusion coefficients in Langevin dynamics. The adjustable parameters are fixed from the comprehensive model-data comparison. We find that a small value of the spatial diffusion coefficient at transition temperature is preferred by data. With the parameter-optimized model, we are able to describe simultaneously the promptanddata atGeV in Pb–Pb collisions atandTeV. We also make predictions for non-promptmeson for future experimental tests down to the low momentum region.
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