论文标题
晶格QCD中的喷气运输系数$ \ hat {q} $
Jet transport coefficient $\hat{q}$ in lattice QCD
论文作者
论文摘要
我们介绍了在Quenched和（2+1）-4-D Euclidean lattice上的（2+1）QCD中的JET传输系数$ \ hat {q} $的第一个计算。能量part顿的光样繁殖是从均方根增益横向到传播方向的均等增益，这是用热场强度野外野战强度相关器表示的。其运营商产品扩展中的领先术语是在晶格上计算的。在多个晶格大小上，基于未质量的晶格数据的连续性外推结果，以及基于非质量晶格数据的完整QCD估计值与（非）扰动计算和$ \ hat {q} $的现象学提取物进行了比较。 $ \ hat {q} $的晶格数据显示与熵密度相似的温度依赖性。在不确定性中，这些与现象学提取与使用扰动理论的计算相反。
We present the first calculation of the jet transport coefficient $\hat{q}$ in quenched and (2+1)-flavor QCD on a 4-D Euclidean lattice. The light-like propagation of an energetic parton is factorized from the mean square gain in momentum transverse to the direction of propagation, which is expressed in terms of the thermal field-strength field-strength correlator. The leading-twist term in its operator product expansion is calculated on the lattice. Continuum extrapolated quenched results, and full QCD estimates based on un-renormalized lattice data, over multiple lattice sizes, are compared with (non) perturbative calculations and phenomenological extractions of $\hat{q}$. The lattice data for $\hat{q}$ show a temperature dependence similar to the entropy density. Within uncertainties, these are consistent with phenomenological extractions, contrary to calculations using perturbation theory.
