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arXiv 1206.6537hep-phnucl-exnucl-th
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介质中重夸克胶子散射的T矩阵计算

A T-Matrix Calculation for in-Medium Heavy-Quark Gluon Scattering

Kyle Huggins, Ralf Rapp

摘要:

利用热力学二体T矩阵计算了夸克-胶子等离子体(QGP)中粲夸克与底夸克的相互作用。我们特别专注于重夸克(HQ)与热胶子的相互作用与输入的HQ自由能的格子QCD计算的动机潜力。后者是实现到一个色库仑和(残余)限制相互作用的场论analgesia。这,特别是,使讨论的潜在的方法,特别是硬热环校正的顶点,从相关的费曼图推导出的相对论性校正,和一个合适的投影上的横向热胶子的修正。将所得势应用于计算不同颜色通道中的散射振幅,并用于计算QGP中相应的HQ阻力系数。得到了比微扰结果约2-3倍的增强,主要是由吸引色通道中的重混驱动的。

英文摘要:

The interactions of charm and bottom quarks in a Quark-Gluon Plasma (QGP) are evaluated using a thermodynamic 2-body T-matrix. We specifically focus on heavy-quark (HQ) interactions with thermal gluons with an input potential motivated by lattice-QCD computations of the HQ free energy. The latter is implemented into a field-theoretic ansatz for color-Coulomb and (remnants of) confining interactions. This, in particular, enables to discuss corrections to the potential approach, specifically hard-thermal-loop corrections to the vertices, relativistic corrections deduced from pertinent Feynman diagrams, and a suitable projection on transverse thermal gluons. The resulting potentials are applied to compute scattering amplitudes in different color channels and utilized for a calculation of the corresponding HQ drag coefficient in the QGP. A factor of ~2-3 enhancement over perturbative results is obtained, mainly driven by the resummation in the attractive color-channels.

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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