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arXiv 1405.3243hep-phnucl-th
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真空和夸克-胶子等离子体中离壳重夸克和上壳重夸克的动力学碰撞能量损失和输运性质

Dynamical collisional energy loss and transport properties of on- and off-shell heavy quarks in vacuum and in the Quark Gluon Plasma

Hamza Berrehrah, Pol-Bernard Gossiaux, Jörg Aichelin, Wolfgang Cassing, Elena Bratkovskaya

摘要:

在这项研究中,我们评估了重夸克的动力学碰撞能量损失,它们的相互作用率以及不同的输运系数(阻力和扩散系数,$\hat{q}$等)。我们计算了这些不同的量i)微扰部分子(在真空中的壳层粒子与固定和运行的耦合)和ii)动力学准粒子(在QGP介质中的壳层粒子在有限的温度$T$与运行的温度耦合所描述的动力学准粒子模型)。我们使用微扰弹性$(q(g) Q \rightarrow q (g) Q)$截面的第一种情况下,和红外增强硬热环截面的第二种情况。在这项工作中得到的结果表明,有限的部分子质量和宽度的影响,重夸克输运性质,并提供了基本成分的明确研究的微观动力学的重口味的QGP -形成在相对论重离子碰撞-内的运输方法以前开发的作者。

英文摘要:

In this study we evaluate the dynamical collisional energy loss of heavy quarks, their interaction rate as well as the different transport coefficients (drag and diffusion coefficients, $\hat{q}$, etc). We calculate these different quantities for i) perturbative partons (on-shell particles in the vacuum with fixed and running coupling) and ii) for dynamical quasi-particles (off-shell particles in the QGP medium at finite temperature $T$ with a running coupling in temperature as described by the dynamical quasi-particles model). We use the perturbative elastic $(q(g) Q \rightarrow q (g) Q)$ cross section for the first case, and the Infrared Enhanced Hard Thermal Loop cross sections for the second. The results obtained in this work demonstrate the effects of a finite parton mass and width on the heavy quark transport properties and provide the basic ingredients for an explicit study of the microscopic dynamics of heavy flavors in the QGP - as formed in relativistic heavy-ion collisions - within transport approaches developed previously by the authors.

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