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arXiv 1111.1220hep-ph
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对NLO + PS匹配方法的评价

A critical appraisal of NLO+PS matching methods

Stefan Hoeche, Frank Krauss, Marek Schonherr, Frank Siegert

摘要:

在这篇文章中,MC@NLO和POWHEG方法之间的不确定性和差异匹配次领先阶QCD计算与部分子淋浴进行了讨论。这两种算法的实现内的事件发生器夏尔巴和基于Catani-Seymour减法的影响进行评估的代表性选择的观测。在MC@NLO的情况下,通过使用偶极减法项来产生第一发射来实现实质性简化。采用相空间限制,其允许以透明的方式改变被取幂的非奇异辐射校正的量。研究了在胶子融合中产生希格斯玻色子玻色子对各种观测量的影响,并将其作为基准过程。在NLO+PS匹配模拟中首次给出了H+喷流产生的情况。由于尺度的选择和非微扰效应的不确定性进行了探讨与喷流的W和Z玻色子的生产。相应的结果进行了比较,从Tevatron和LHC实验的数据。

英文摘要:

In this publication, uncertainties in and differences between the MC@NLO and POWHEG methods for matching next-to-leading order QCD calculations with parton showers are discussed. Implementations of both algorithms within the event generator Sherpa and based on Catani-Seymour subtraction are employed to assess the impact on a representative selection of observables. In the case of MC@NLO a substantial simplification is achieved by using dipole subtraction terms to generate the first emission. A phase space restriction is employed, which allows to vary in a transparent way the amount of non-singular radiative corrections that are exponentiated. Effects on various observables are investigated, using the production of a Higgs boson in gluon fusion, with or without an associated jet, as a benchmark process. The case of H+jet production is presented for the first time in an NLO+PS matched simulation. Uncertainties due to scale choices and non-perturbative effects are explored in the production of W and Z bosons in association with a jet. Corresponding results are compared to data from the Tevatron and LHC experiments.

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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