arXiv 2102.077832021-02-15hep-phhep-ex

与部分子簇射相匹配的NLO胶子聚变中的四轻子产生

Four-lepton production in gluon fusion at NLO matched to parton showers

Simone Alioli, Silvia Ferrario Ravasio, Jonas M. Lindert, Raoul Röntsch

备注：: 15 pages, 13 figures, 1 table
DOI：: 10.1140/epjc/s10052-021-09470-5

摘要：

本文用POWHEG方法计算了Pythia 8部分子簇射对胶子诱导的电弱规范玻色子对产生$gg \to ZZ$和$gg \to W^+W^-$的次领先阶QCD修正。计算始终结合了连续背景，希格斯介导的$gg\to H^* \to VV$过程，以及它们的干扰。我们考虑轻子衰变模式的大量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先秩序，因此包含两个回路的虚拟贡献，以及回路平方的实际贡献。粒子簇射效应被认为是边际的包容性观测和相当可观的观测是排他性的额外的喷流辐射。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密分析的diboson生产和希格斯玻色子在壳外制度。

英文摘要：

We present a calculation of the next-to-leading order (NLO) QCD corrections to gluon-induced electroweak gauge boson pair production, $gg \to ZZ$ and $gg \to W^+W^-$, matched to the PYTHIA8 parton shower in the POWHEG approach. The calculation consistently incorporates the continuum background, the Higgs-mediated $gg\to H^* \to VV$ process, and their interference. We consider leptonic decay modes of the massive 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.

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