用$x$和标度依赖求解$\hat{q}$难题
Solving the $\hat{q}$ puzzle with $x$ and scale dependence
摘要：
我们在这里提出了一个可能的解决方案的射流淬火参数$\hat{q}$难题探索的动量分数$x$和规模$Q^2$依赖的$\hat{q}$，除了温度依赖性。我们研究了由于Glauber胶子与夸克-胶子等离子体（QGP）交换而引起的喷注动量展宽。这使我们定义了QGP中部分子的动量分数$x$。我们还首次在这里展示了QGP的部分子分布函数的可能形式。将QGP-PDF作为$\hat{q}$的输入，用于同时拟合PHENIX和CMS数据。我们观察到QGP-PDF的尺度演化和喷流的能量是RHIC碰撞中相同温度下$\hat{q}$增强的缺失成分。
英文摘要：
We present here a possible resolution of the jet quenching parameter $\hat{q}$ puzzle by exploring the momentum fraction $x$ and scale $Q^2$ dependence of $\hat{q}$, in addition to temperature dependence. We explore the momentum broadening of the jet due to Glauber gluon exchange with the quark-gluon plasma (QGP). This has led us to define the momentum fraction $x$ for the partons in the QGP. We also show here, for the first time, possible forms of the parton distribution function (PDF) of the QGP. The QGP-PDF as input in $\hat{q}$ has been used to fit the PHENIX and CMS data simultaneously. We observe that the scale evolution of the QGP-PDF and the energy of the jet are the missing ingredients responsible for the enhancement of $\hat{q}$ at the same temperature in RHIC collisions compared to LHC collisions.
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