标题： YaJEM - 一种介质中喷注演化蒙特卡罗代码 显示英文标题

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

摘要： 高横动量（P_T）的QCD散射过程被视为研究重离子碰撞中产生的介质的有用工具，因为根据不确定性原理，它们的截面应该可以独立于介质特性进行计算，而介质仅会修改从硬顶点产生的最终状态部分子。 随着欧洲核子研究中心（CERN）大型强子对撞机（LHC）的重离子物理计划即将开始，重离子碰撞中高P_T物理的关注点正从硬单个强子的观测转向完全重建的喷注。 然而，低P_T背景介质的存在使得喷注寻找比质子-质子碰撞更为复杂。 设计用于模拟部分子簇射演化为强子喷注的蒙特卡罗（MC）代码是理解介质对喷注的修改与特定喷注寻找方案引入的偏差之间复杂相互作用的有用工具。 然而，这些代码也使用了一组近似方法，需要与更易于理解的单个高P_T强子观测进行对比测试。 在本文中，我回顾了YaJEM（另一个喷注能量损失模型）蒙特卡罗代码的基本思想，并介绍了该代码获得的一些结果。 显示英文摘要

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.