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arXiv 2004.12056hep-thhep-ph
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变形弦位形下运动重夸克的拖曳力

Drag force on a moving heavy quark with deformed string configuration

Sara Tahery, Xurong Chen

摘要:

为了研究运动重夸克在等离子体中的拖曳力,我们采用了变形的AdS时空,其中变形参数$c$描述了AdS/QCD中的非共形性。在这种情况下,夸克被映射到AdS空间中的探测弦。考虑到探针弦中形变参数的可能贡献,我们将一种一般形式的c相关弦探针应用于拖曳力的计算。然后,我们找到这个参数的可接受的值,因为它满足QCD计算。利用这个结果,我们还讨论了扩散常数,这与非相对论极限的唯象结果一致。我们还表明,而在没有变形参数,探针串是一个严格的径向坐标的递增函数,c依赖的探针串有一个最大值与$z$。

英文摘要:

To study drag force on a moving heavy quark through a plasma, we use a deformed AdS space-time, in which deformation parameter $c$ describes non-conformality in AdS/QCD. In this case the quark is mapped to a probe string in the AdS space. Considering probable contribution of deformation parameter in the probe string, we apply a general form of c-dependent string ansatz in the drag force computation. Then we find the acceptable value of this parameter as it satisfies QCD calculations. Using this result, we also discuss diffusion constant which is in agreement with phenomenological result for non-relativistic limit. Also we show that while in absence of deformation parameter, probe string is a strictly increasing function of radial coordinate, the c-dependent probe string has a maximum value versus $z$.

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