Bulk medium evolution has considerable effects on jet observables
Bulk medium evolution has considerable effects on jet observables
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DOI：
10.1103/physrevc.106.l021902
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发表时间：
2020-01
影响因子：
3.1
通讯作者：
Y. Tachibana;C. Shen;A. Majumder
中科院分区：
文献类型：
--
作者：
Y. Tachibana;C. Shen;A. Majumder
在QCD中，我们考虑了单个喷流在有限范围的强相互作用流体中传播的情况。相互作用导致流体中出现能量-动量源。分析逃离容器的残余射流以及由该射流激发的部分介质。我们研究了静态介质与膨胀介质的相互作用，其中喷流向内运动与向外运动，考虑了基于弱耦合描述的部分子散射中通过反冲的介质响应，以及基于强耦合描述的流体力学介质响应的组合，然后结合到喷流中。研究了这些极限对喷注的重建能量、动量和质量的影响，作为远离原始部分子方向的角度的函数。结果表明，介质中不同的流速结构对喷流观测值有很大的影响。这项工作强调了对软介质进行准确的动力学建模作为计算射流修正的基础的重要性，并对没有这种建模的结果表示怀疑。
We consider the case, in QCD, of a single jet propagating within a strongly interacting fluid, of finite extent. Interactions lead to the appearance of a source of energy-momentum within the fluid. The remnant jet that escapes the container is analyzed along with portions of the medium excited by the jet. We study the effect of a static versus an expanding medium, with jets traveling inward versus outward, considering the medium response via recoils in partonic scatterings based on a weakly-coupled description and its combination with hydrodynamical medium response based on a strongly-coupled description, followed by incorporation into a jet. The effect of these limits on the reconstructed energy, momentum and mass of the jet, as a function of the angle away from the original parton direction are studied. It is demonstrated that different flow velocity configurations in the medium produce considerable differences in jet observables. This work highlights the importance of accurate dynamical modeling of the soft medium as a foundation on which to calculate jet modification, and casts skepticism on results obtained without such modeling.