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arXiv 1608.03577hep-ph
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Powheg-Pythia匹配方案在双喷流事件NLO模拟中的作用

Powheg-Pythia matching scheme effects in NLO simulation of dijet events

Andy Buckley, Debottam Bakshi Gupta

摘要:

LHC对撞机事件的蒙特卡罗模拟最重要的发展之一是部分子簇射与QCD耦合中次领先阶计算的矩阵元匹配的方案和代码的到来。的POWHEG计划,特别是它的实现在POWHEG-BOX代码,吸引了最多的关注,由于易于使用和有效的部分子簇射算法之间的可移植性。但形式上的准确性NLO并不保证预测性,和超越固定阶的修正与淋浴可能是大的。此外,有开放的问题,这是“最好的”变体的POWHEG匹配过程中使用,以及如何评估系统的不确定性,由于该计划的自由度。在本文中,我们经验性地探讨了Pythia 8匹配到POWHEG-BOX dijet事件中允许的方案变化,展示了发射否决细节中的离散和连续自由度对数据调谐和从POWHEG-BOX+ Pythia 8发电机组合的匹配和部分子簇射方面估计系统不确定性的影响。

英文摘要:

One of the most important developments in Monte Carlo simulation of collider events for the LHC has been the arrival of schemes and codes for matching of parton showers to matrix elements calculated at next-to-leading order in the QCD coupling. The POWHEG scheme, and particularly its implementation in the POWHEG-BOX code, has attracted most attention due to ease of use and effective portability between parton shower algorithms. But formal accuracy to NLO does not guarantee predictivity, and the beyond-fixed-order corrections associated with the shower may be large. Further, there are open questions over which is the "best" variant of the POWHEG matching procedure to use, and how to evaluate systematic uncertainties due to the degrees of freedom in the scheme. In this paper we empirically explore the scheme variations allowed in Pythia8 matching to POWHEG-BOX dijet events, demonstrating the effects of both discrete and continuous freedoms in emission vetoing details for both tuning to data and for estimation of systematic uncertainties from the matching and parton shower aspects of the POWHEG-BOX+Pythia8 generator combination.

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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