arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0705.1719hep-ph
收藏

获得部分子簇射的解析控制

Gaining analytic control of parton showers

Christian W. Bauer, Frank J. Tackmann

摘要:

部分子簇射被广泛用于产生完全排他的最终状态,以将理论模型与实验观测进行比较。虽然,一般来说,部分子簇射给出了很好的描述的实验数据,事件生成的概率分布的精确函数形式通常是未知的。原因是现实的部分子簇射需要在每个顶点保持四动量。在本文中,我们详细研究如何在标准部分子簇射中强制执行四动量守恒,以及为什么这会破坏概率分布的分析控制。我们展示了如何修改部分子簇射算法,使其在每个顶点保存四个动量,但其中的概率分布的完整解析形式是已知的。然后,我们评论如何使用这种分析控制来将矩阵元计算与部分子簇射匹配,并估计部分子簇射中功率修正和其他不确定性的影响。

英文摘要:

Parton showers are widely used to generate fully exclusive final states needed to compare theoretical models to experimental observations. While, in general, parton showers give a good description of the experimental data, the precise functional form of the probability distribution underlying the event generation is generally not known. The reason is that realistic parton showers are required to conserve four-momentum at each vertex. In this paper we investigate in detail how four-momentum conservation is enforced in a standard parton shower and why this destroys the analytic control of the probability distribution. We show how to modify a parton shower algorithm such that it conserves four-momentum at each vertex, but for which the full analytic form of the probability distribution is known. We then comment how this analytic control can be used to match matrix element calculations with parton showers, and to estimate effects of power corrections and other uncertainties in parton showers.

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。

↑