arXiv 0809.44332008-09-25hep-ph

一种中等修正的部分子簇射算法的实现

Implementation of a medium-modified parton shower algorithm

N. Armesto, L. Cunqueiro, C. A. Salgado

备注：: LaTeX, 6 pages, 2 eps figures; proceedings of the 3rd International Conference on Hard and Electromagnetic Probes in High-Energy Nuclear Collisions - Hard Probes 2008 (Illa de A Toxa, Spain, June 8th-14th 2008)
发表信息：: Eur.Phys.J.C61:775-778,2009
DOI：: 10.1140/epjc/s10052-008-0824-y

摘要：

我们提出了一个蒙特卡罗实现的介质诱导胶子辐射的末态分支过程。介质效应通过分裂函数中的加性项引入。我们已经在PYTHIA中实施了此类修改。我们展示了驼峰平台上的介质效应，以及相对于母部分子的横向动量和角分布。正如预期的那样，随着介质密度的增加，具有小（大）动量分数的部分子增加（减少），并且观察到角展宽。对横向动量分布的影响更多地涉及，与增强的低-和中间- $p_T$部分子和减少在大$p_T$，这与能量守恒，并在我们的方法中缺乏与介质的动量交换。

英文摘要：

We present a Monte Carlo implementation of medium-induced gluon radiation in the final-state branching process. Medium effects are introduced through an additive term in the splitting functions. We have implemented such modification within PYTHIA. We show the medium effects on the hump-backed plateau, and the transverse momentum and angular distributions with respect to the parent parton. As expected, with increasing medium densities there is an increase (decrease) of partons with small (large) momentum fraction, and angular broadening is observed. The effects on the transverse-momentum distributions are more involved, with an enhancement of low- and intermediate-$p_T$ partons and a decrease at large $p_T$, which is related to energy conservation, and to the lack of momentum exchange with the medium in our approach.

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摘要：

英文摘要：

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