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首页> 外文期刊>Physical review, C >Probing the in-medium QCD force by open heavy-flavor observables
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Probing the in-medium QCD force by open heavy-flavor observables

机译：通过开放的重型风味观察探测中型QCD力

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摘要

The determination of the color force in a quark-gluon plasma (QGP) is a key objective in the investigation of strong-interaction matter. Open and hidden heavy-flavor observables in heavy-ion collisions (HICs) are believed to provide insights into this problem by comparing calculations of heavy-quark (HQ) and quarkonium transport with pertinent experimental data. In this work, we utilize the T-matrix formalism to compute charm-quark transport coefficients for various input potentials previously extracted from simultaneous fits to lattice-QCD data for HQ free energies, quarkonium correlators, and the QGP equation of state. We investigate the impact of off-shell effects (spectral functions) in the QGP medium on the HQ transport, and compare to earlier results using the free or internal HQ energies as potential proxies. We then employ the transport coefficients in relativistic Langevin simulations for HICs to test the sensitivity of heavy-flavor observables to the HQ interactions in the QGP. We find that a strongly coupled T-matrix solution generates a HQ elliptic flow comparable to the results from the internal energy at low momentum, driven by a long-range remnant of the confining force, while falling off stronger with increasing three-momentum. The weakly coupled T-matrix solution, whose underlying potential is close to the free energy, leads to an elliptic flow well below the experimentally observed range.
机译：夸克 - 胶质等离子体（QGP）中的颜色力的测定是对强互动物质的研究的关键目标。通过比较重型夸克（HQ）和Quarkonium运输与相关实验数据的计算，据信开放和隐藏的重型血液碰撞（HICS）中的富集可观察能力提供了对该问题的洞察。在这项工作中，我们利用T矩阵形式主义来计算先前从同时拟合的各种输入电位的Charm-Quark传输系数，用于HT为HT的Lattice-QCD数据，以及状态的QGP方程。我们调查在总HQ传输上的QGP介质中的离壳效应（光谱功能）的影响，并与使用自由或内部HQ能量作为潜在代理的早期结果进行比较。然后，我们采用相对论Langevin模拟中的传输系数，以测试QGP中HQ相互作用的重型风味可观察的灵敏度。我们发现强烈耦合的T型矩阵溶液产生与低动量下的内部能量的结果相当的HQ椭圆形式，由限制力的远程残余驱动，同时随着三势的增加而脱落。弱耦合的T型矩阵溶液，其潜在潜在接近自由能，导致椭圆流低于实验观察范围。

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