arXiv 0811.16032008-11hep-ph

射流淬火中的O（g）等离子体效应

O(g) plasma effects in jet quenching

Simon Caron-Huot

备注：: 24 pages, 4 figures, typo fixed in equation (3)
发表信息：: Phys.Rev.D79:065039,2009
DOI：: 10.1103/PhysRevD.79.065039

摘要：

本文研究了弱耦合条件下高能部分子在夸克-胶子等离子体中运动时的韧致辐射能量损失。我们表明，这些过程的速率接收大O（g）的经典（nonabelian）等离子体物理的影响，这是计算的修正。在高能量（深LPM）制度，这些修正可以被吸收的横向动量加宽系数$\hat{q}$，我们给下一个领先的顺序的变化。即使在相对弱的耦合$α_s\sim 0.1$下，校正也很大，这通常是针对这种效应发现的，表明微扰膨胀的困难。我们的方法是基于一个有效的“欧几里德化”的经典物理性质附近的光锥，这使得一个有效的理论方法的基础上降维，并提出了一个新的可能性，这些影响的非微扰晶格研究。

英文摘要：

We consider the bremsstrahlung energy loss of high energy partons moving in the quark-gluon plasma, at weak coupling. We show that the rates for these processes receive large O(g) corrections from classical (nonabelian) plasma physics effects, which are calculated. In the high-energy (deep LPM) regime these corrections can be absorbed in a change of the transverse momentum broadening coefficient $\hat{q}$, which we give to the next-to-leading order. The correction is large even at relatively weak couplings $α_s\sim 0.1$, as is typically found for such effects, signaling difficulties with the perturbative expansion. Our approach is based on an effective "Euclideanization" property of classical physics near the light-cone, which allows an effective theory approach based on dimensional reduction and suggests a new possibility for the nonperturbative lattice study of these effects.

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