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arXiv 1208.4253hep-phhep-lathep-thnucl-th
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喷注猝灭参量的规范不变定义

Gauge invariant definition of the jet quenching parameter

Michael Benzke, Nora Brambilla, Miguel Angel Escobedo, Antonio Vairo

摘要:

在软共线有效理论的框架下,通过在高能共线部分子在介质中的传播中加入Glauber胶子相互作用的影响,计算了喷注猝灭参数$\hat{q}$.这个结果在协变规范中成立,并用沿部分子四动量方向伸展的两条威尔逊线的期望值表示。在本文中,我们展示了如何表达可以推广到一个任意的规范,通过添加横向威尔逊线。横向威尔逊线的显式计算的部分子与Glauber胶子的相互作用,只出现在非协变规范的重新计算。作为结果的应用,我们讨论了弱耦合夸克-胶子等离子体中$g^2T$阶横动量对$\hat{q}$的贡献.

英文摘要:

In the framework of Soft-Collinear Effective Theory, the jet quenching parameter, $\hat{q}$, has been evaluated by adding the effect of Glauber gluon interactions to the propagation of a highly-energetic collinear parton in a medium. The result, which holds in covariant gauges, has been expressed in terms of the expectation value of two Wilson lines stretching along the direction of the four-momentum of the parton. In this paper, we show how that expression can be generalized to an arbitrary gauge by the addition of transverse Wilson lines. The transverse Wilson lines are explicitly computed by resumming interactions of the parton with Glauber gluons that appear only in non-covariant gauges. As an application of our result, we discuss the contribution to $\hat{q}$ coming from transverse momenta of order $g^2T$ in a medium that is a weakly-coupled quark-gluon plasma.

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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