论文标题
QCD动力学理论中的喷气热化
Jet thermalization in QCD kinetic theory
论文作者
论文摘要
我们在QCD动力学理论中进行数值研究，以研究高能量part顿的能量和角度谱 - 作为喷射产生的重离子碰撞的代理 - 穿过夸克 - 格鲁恩等离子体（QGP）。我们发现，快速部分主要是通过辐射湍流的Gluon级联反向等离子体的能量，该级联的速度从射流向下运输到发生耗散的温度尺度。在第一阶段，发现湍流级联反应的角结构是相对准直的。但是，当损失的能量达到等离子温度时，它迅速将其转移到W.R.T.射流轴并热化。我们研究了软射流成分对总射流能量的贡献。我们表明，对于大约0.3 rad或更小的喷气开关角度，效果可以忽略不计。相反，较大的开口角变得越来越敏感，因此对射流的热成分，从而对中等响应变得越来越敏感。我们的结果展示了喷气锥大小在缓解或增强喷气淬灭可观察物中耗散细节的重要性。
We perform numerical studies in QCD kinetic theory to investigate the energy and angular profiles of a high energy parton - as a proxy for a jet produced heavy ion collisions - passing through a Quark-Gluon Plasma (QGP). We find that the fast parton loses energy to the plasma mainly via a radiative turbulent gluon cascade that transport energy locally from the jet down to the temperature scale where dissipation takes place. In this first stage, the angular structure of the turbulent cascade is found to be relatively collimated. However, when the lost energy reaches the plasma temperature is it rapidly transported to large angles w.r.t. the jet axis and thermalizes. We investigate the contribution of the soft jet constituents to the total jet energy. We show that for jet opening angles of about 0.3 rad or smaller the effect is negligible. Conversely, larger opening angles become more and more sensitive to the thermal component of the jet and thus to medium response. Our result showcase the importance of the jet cone size in mitigating or enhancing the details of dissipation in jet quenching observables.
