Jets, Bulk Matter, and their Interaction in Heavy Ion Collisions at Several TeV
Jets, Bulk Matter, and their Interaction in Heavy Ion Collisions at Several TeV
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DOI：
10.1103/physrevc.85.064907
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发表时间：
2012-03
影响因子：
3.1
通讯作者：
K. Werner;I. Karpenko;M. Bleicher;T. Pierog;S. Porteboeuf-Houssais
中科院分区：
文献类型：
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作者：
K. Werner;I. Karpenko;M. Bleicher;T. Pierog;S. Porteboeuf-Houssais
我们讨论了一个理论方案，说明大块物质，射流和两者之间的相互作用。目的是在所有横向动量（$p_{t}$）尺度上对粒子产生的完整描述。在该图中，硬初始散射主要产生纵向磁通管，横向移动的碎片携带硬散射的部分的$p_{t}$。这些通量管最终构成了大块物质（热化和流动）和射流。我们引入了一个基于部分能量损失的准则来决定给定的弦段是对整体有贡献还是使物质最终成为强子射流。从本质上讲，体积内部的低p_{t}$段将构成体积，高p_{t}$段（或非常接近表面的段）有助于射流。后者是在通常的磁通管通过q-qbar生产（Schwinger机制）断裂后出现的。有趣的是过渡区：中间$p_{t}$段产生于靠近表面的物质内部，但有足够的能量逃逸，应该是从热物质中拾取q-qbar对，而不是通过Schwinger机制产生它们。这表示射流与流动的大块物质之间的通信（流体-射流相互作用）。射流强子和软强子之间的相互作用也是非常重要的。我们利用新图像来研究2.76 TeV的Pb-Pb碰撞。我们讨论了粒子产生的中心性和p_{t}$依赖性，以及在p_{t}$和p_{t}$上的长距离对子关联。
We discuss a theoretical scheme that accounts for bulk matter, jets, and the interaction between the two. The aim is a complete description of particle production at all transverse momentum ($p_{t}$) scales. In this picture, the hard initial scatterings result in mainly longitudinal flux tubes, with transversely moving pieces carrying the $p_{t}$ of the partons from hard scatterings. These flux tubes constitute eventually both bulk matter (which thermalizes and flows) and jets. We introduce a criterion based on parton energy loss to decide whether a given string segment contributes to the bulk or leaves the matter to end up as a jet of hadrons. Essentially low $p_{t}$ segments from inside the volume will constitute the bulk, high $p_{t}$ segments (or segments very close to the surface) contribute to the jets. The latter ones appear after the usual flux tube breaking via q-qbar production (Schwinger mechanism). Interesting is the transition region: Intermediate $p_{t}$ segments produced inside the matter close to the surface but having enough energy to escape, are supposed to pick up q-qbar pairs from the thermal matter rather than creating them via the Schwinger mechanism. This represents a communication between jets and the flowing bulk matter (fluid-jet interaction). Also very important is the interaction between jet hadrons and the soft hadrons from the fluid freeze-out. We employ the new picture to investigate Pb-Pb collisions at 2.76 TeV. We discuss the centrality and $p_{t}$ dependence of particle production and long range dihadron correlations at small and large $p_{t}$.