arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1307.2188nucl-th
收藏

用重夸克检验早期夸克-胶子等离子体耦合强度

Tests of the Quark-Gluon Plasma Coupling Strength at Early Times with Heavy Quarks

Andrew M. Adare, Michael P. McCumber, James L. Nagle, Paul Romatschke

备注：
5 pages, 8 figures
发表信息：
Phys. Rev. C 90, 024911 (2014)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

在夸克-胶子等离子体中，重夸克通过相互作用在动量空间中的重新分布是重夸克与介质耦合强度的一个很好的探测。我们利用MonteCarlo Langevin计算来追踪粘滞流体动力学时空演化中的重夸克-反夸克对。我们发现，在最高温度达到的早期，粲夸克的核修正因子（$R_{AA}$）对与夸克-胶子等离子体的耦合相对不敏感。相反，粲夸克和反粲夸克的方位角关联对早期时间演化极为敏感。对于美夸克，情况在敏感性方面正好相反。未来对重夸克的测量有可能绘制出剪切粘度与熵密度比（η/s）的温度依赖性。

英文摘要：

The redistribution in momentum space of heavy quarks via their interactions in the quark-gluon plasma is an excellent probe of the heavy quark coupling strength to the medium. We utilize a Monte Carlo Langevin calculation for tracking heavy quark - antiquark pairs embedded in a viscous hydrodynamic space-time evolution. We find that the nuclear modification factor ($R_{AA}$) for charm quarks is relatively insensitive to the coupling to the quark-gluon plasma at early times where the highest temperatures are acheived. In contrast the azimuthal angular correlation of charm and anticharm quarks is extremely sensitive to the early time evolution. For beauty quarks the situation is reversed in terms of sensitivity. Future measurements of heavy quarks have the potential to map out the temperature dependence of the shear viscosity to entropy density ratio (η/s).

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。

↑