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arXiv 0904.4885hep-ph
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JEWEL --射流淬火的Monte Carlo模型

JEWEL - a Monte Carlo Model for Jet Quenching

Korinna Zapp, Johanna Stachel, Urs Achim Wiedemann

摘要:

Monte Carlo模型JEWEL 1.0(Jet Evolution With Energy Loss)模拟了稠密QCD介质中部分子簇射的演化。在其目前的形式中,介质相互作用被建模为基于微扰矩阵元的弹性散射和介质诱导胶子辐射的简单处方。部分子簇射与强子化模型连接。在没有介质效应的情况下,JEWEL被证明在LEP再现射流测量。碰撞能量损失与分析计算一致,但使用JEWEL,我们可以更进一步,也可以排除射流引起的介质修改。弹性和非弹性介质的相互作用,导致独特的修改的射流破碎模式,这应该允许实验区分碰撞和辐射能量损失机制。在这些程序中的主要JEWEL结果进行了总结,并概述了蒙特卡罗算法,允许在概率框架中包括朗道-Pomerantschuk-Migdal效应。

英文摘要:

The Monte Carlo model JEWEL 1.0 (Jet Evolution With Energy Loss) simulates parton shower evolution in the presence of a dense QCD medium. In its current form medium interactions are modelled as elastic scattering based on perturbative matrix elements and a simple prescription for medium induced gluon radiation. The parton shower is interfaced with a hadronisation model. In the absence of medium effects JEWEL is shown to reproduce jet measurements at LEP. The collisional energy loss is consistent with analytic calculations, but with JEWEL we can go a step further and characterise also jet-induced modifications of the medium. Elastic and inelastic medium interactions are shown to lead to distinctive modifications of the jet fragmentation pattern, which should allow to experimentally distinguish between collisional and radiative energy loss mechanisms. In these proceedings the main JEWEL results are summarised and a Monte Carlo algorithm is outlined that allows to include the Landau-Pomerantschuk-Migdal effect in probabilistic frameworks.

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