arXiv 1106.34732011-06nucl-ex

在CMS上研究PbPb碰撞中的喷流淬灭

Studies of Jet Quenching in PbPb collisions at CMS

Matthew Nguyen

备注：: Proceedings of presentation given at the 6th International Workshop High-pT physics at LHC 2011 in Utrecht, Netherlands April 4-7th, 2011

摘要：

喷流是探测超相对论性重离子碰撞中产生的热稠密介质的重要工具。在大型强子对撞机（LHC）的碰撞能量下，有大量的硬过程产生，使得高p_T喷流可以与重离子事件区分开来。多用途紧凑型μ子螺线管（CMS）探测器设计精良，可通过其高质量的量热计和高精度硅跟踪器测量硬散射过程。在CMS中研究了sqrt（sNN）= 2.76TeV的PbPb碰撞中的喷注猝灭.作为中心性的函数，具有高p_T领先喷流的双射流事件被发现具有增加的动量不平衡，这是显着大于模拟预测。通过将带电径迹与量热计中测量的射流相关联，探索了射流破碎产物的角分布。通过将带电径迹的动量投影到超前喷流轴上，表明如果考虑低p_T径迹，超前双喷流对的动量不平衡可以恢复。这些软颗粒携带的平衡动量的大部分以相对于射流的大角度辐射。

英文摘要：

Jets are an important tool to probe the hot, dense medium produced in ultra-relativistic heavy-ion collisions. At the collision energies available at the Large Hadron Collider (LHC), there is copious production of hard processes, such that high p_T jets may be differentiated from the heavy-ion underlying event. The multipurpose Compact Muon Solenoid (CMS) detector is well designed to measure hard scattering processes with its high quality calorimeters and high precision silicon tracker. Jet quenching has been studied in CMS in PbPb collisions at sqrt(s_NN)= 2.76 TeV. As a function of centrality, dijet events with a high p_T leading jet were found to have an increasing momentum imbalance that was significantly larger than predicted by simulations. The angular distribution of jet fragmentation products has been explored by associating charged tracks with the jets measured in the calorimeters. By projecting the momenta of charged tracks onto the leading jet axis it is shown that the apparent momentum imbalance of the leading dijet pair can be recovered if low p_T tracks are considered. A large fraction of the balancing momentum carried by these soft particles is radiated at large angle relative to the jets.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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