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arXiv 2108.05337hep-ph
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在nNNLO + PS和MiNNLO $_{\text{PS}}$生产$ZZ$

$ZZ$ production at nNNLO+PS with MiNNLO$_{\text{PS}}$

Luca Buonocore, Gabriël Koole, Daniele Lombardi, Luca Rottoli, Marius Wiesemann, Giulia Zanderighi

摘要:

我们考虑了强子碰撞中的$ZZ$产生,并提出了与部分子簇射相匹配的QCD微扰理论的最新预测。下一个到下一个到领先的阶修正夸克发起的通道结合使用MiNNLO $_{\text{PS}}$方法的部分子阵雨,而下一个到领先的阶修正的环路诱导胶子融合通道匹配使用POWHEG方法。他们的组合,被称为nNNLO+PS,构成了迄今为止对$ZZ$事件的最佳理论描述。通过计算全过程$pp \to \ell^+\ell^-\ell^{(\prime)+}\ell^{(\prime)-}$,计算了自旋关联、干涉和离壳层效应。我们显示了夸克和胶子发起的过程以及部分子淋浴在某些运动学制度的相关性的高阶修正的至关重要的影响。我们的预测与最近的LHC数据非常一致。

英文摘要:

We consider $ZZ$ production in hadronic collisions and present state-of-the-art predictions in QCD perturbation theory matched to parton showers. Next-to-next-to-leading order corrections to the quark-initiated channel are combined with parton showers using the MiNNLO$_{\text{PS}}$ method, while next-to-leading order corrections to the loop-induced gluon fusion channel are matched using the POWHEG method. Their combination, dubbed nNNLO+PS, constitutes the best theoretical description of $ZZ$ events to date. Spin correlations, interferences and off-shell effects are included by calculating the full process $pp \to \ell^+\ell^-\ell^{(\prime)+}\ell^{(\prime)-}$. We show the crucial impact of higher-order corrections for both quark- and gluon-initiated processes as well as the relevance of the parton shower in certain kinematical regimes. Our predictions are in very good agreement with recent LHC data.

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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