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arXiv 1102.1114hep-ph
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体演化模型对重夸克唯象的影响

The influence of bulk evolution models on heavy-quark phenomenology

Pol Bernard Gossiaux, Sascha Vogel, Hendrik van Hees, Joerg Aichelin, Ralf Rapp, Min He, Marcus Bluhm

摘要:

研究了重离子碰撞中不同的夸克-胶子等离子体膨胀方案对重夸克谱和椭圆流的影响。对于相同的重夸克输运系数,相对论朗之万模拟与不同的膨胀方案可以导致明显的变化,在计算的重夸克谱的抑制和椭圆流,由高达两个因素。两套输运系数的交叉比较支持这些发现,说明了现实的膨胀模型的重要性,定量评价重夸克观测的重离子碰撞。它还证明,在冻结处方和朗之万实现的差异在这些变化中发挥了重要作用。光夸克观测是必不可少的,在减少与大体积物质演化的不确定性,即使不确定性,由于冻结处方持续存在。

英文摘要:

We study the impact of different Quark-Gluon Plasma expansion scenarios in heavy-ion collisions on spectra and elliptic flow of heavy quarks. For identical heavy-quark transport coefficients relativistic Langevin simulations with different expansion scenarios can lead to appreciable variations in the calculated suppression and elliptic flow of the heavy-quark spectra, by up to a factor of two. A cross comparison with two sets of transport coefficients supports these findings, illustrating the importance of realistic expansion models for quantitative evaluations of heavy-quark observables in heavy-ion collisions. It also turns out that differences in freeze-out prescriptions and Langevin realizations play a significant role in these variations. Light-quark observables are essential in reducing the uncertainties associated with the bulk-matter evolution, even though uncertainties due to the freeze-out prescription persist.

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