Four-lepton production in gluon fusion at NLO matched to parton showers
Four-lepton production in gluon fusion at NLO matched to parton showers
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DOI：
10.1140/epjc/s10052-021-09470-5
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
S. Alioli;S. F. Ravasio;J. Lindert;R. Röntsch
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文献类型：
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作者：
S. Alioli;S. F. Ravasio;J. Lindert;R. Röntsch
本文计算了胶子诱导的电弱规范玻色子对产生的次领先阶（NLO）QCD修正，并用POWHEG方法与PYTHIA 8部分子簇射相匹配。计算始终结合了连续谱背景，希格斯介导的过程，以及它们的干扰。我们考虑轻子衰变模式的矢量玻色子和保留离壳和非共振的贡献。所考虑的过程是回路诱导的领导阶，因此包含两个回路的虚拟贡献，以及回路平方真实的贡献。研究发现，帕顿簇射效应在包容性观测值中很小，而在排除额外喷流辐射的观测值中却相当大。这里提出的蒙特卡罗发生器允许现实的实验效果纳入国家的最先进的精度分析的diboson生产和希格斯玻色子在壳外制度。
We present a calculation of the next-to-leading order (NLO) QCD corrections to gluon-induced electroweak gauge boson pair production,and, matched to the PYTHIA 8 parton shower in the POWHEG approach. The calculation consistently incorporates the continuum background, the Higgs-mediatedprocess, and their interference. We consider leptonic decay modes of the vector bosons and retain offshell and non-resonant contributions. The processes considered are loop-induced at leading order and thus contain two-loop virtual contributions as well as loop-squared real contributions. Parton-shower effects are found to be marginal in inclusive observables and quite sizeable in observables that are exclusive in additional jet radiation. The Monte Carlo generator presented here allows for realistic experimental effects to be incorporated in state-of-the-art precision analyses of diboson production and of the Higgs boson in the offshell regime.