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arXiv 1009.3740hep-ph
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YaJEM --介质簇射演化的Monte Carlo程序

YaJEM - a Monte Carlo code for in-medium shower evolution

Thorsten Renk

摘要:

高横动量(P_T)QCD散射过程被认为是研究重离子碰撞中产生的介质的一个有价值的工具,因为由于不确定性的原因,它们的截面应该是可计算的,而介质只修改从硬顶点出现的末态部分子。随着欧洲核子研究中心(CERN)大型强子对撞机(LHC)重离子物理计划的实施,重离子碰撞中高P_T物理的研究重点正从对硬单强子的观测转向对完全重构喷注的研究。然而,与p-p碰撞相比,在低P_T下背景介质的存在使喷流发现复杂化。蒙特卡罗(MC)代码设计来模拟部分子簇射演变成强子喷注的演变是有价值的工具,以了解复杂的相互作用之间的介质修改的喷注和特定的喷注发现计划引入的偏见。然而,这样的代码也使用了一套近似,需要测试对更好地理解单高P_T强子观测值。在本文中,我回顾了MC代码YaJEM(又一个喷气能量损失模型)的基本思想,并提出了一些结果与代码。

英文摘要:

High transverse momentum (P_T) QCD scattering processes are regarded as a valuable tool to study the medium produced in heavy-ion collisions, as due to uncertainty arguments their cross section should be calculable independent of medium properties whereas the medium then modifies only the final state partons emerging from a hard vertex. With the heavy-ion physics program at the CERN LHC imminent, the attention of high P_T physics in heavy ion collisions is shifting from the observation of hard single hadrons to fully reconstructed jets. However, the presence of a background medium at low P_T complicates jet-finding as compared to p-p collisions. Monte-Carlo (MC) codes designed to simulate the evolution of parton showers evolving into hadron jets are valuable tools to understand the complicated interplay between the medium modification of the jet and the bias introduced by a specific jet-finding scheme. However, such codes also use a set of approximations which needs to be tested against the better understood single high P_T hadron observables. In this paper, I review the ideas underlying the MC code YaJEM (Yet another Jet Energy-loss Model) and present some of the results obtained with the code.

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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