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arXiv 2303.06159hep-ph
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LHC Run II的顶夸克遗产用于PDF和SMEFT分析

The top quark legacy of the LHC Run II for PDF and SMEFT analyses

Zahari Kassabov, Maeve Madigan, Luca Mantani, James Moore, Manuel Morales Alvarado, Juan Rojo, Maria Ubiali

AI总结:

本研究利用LHC Run II完整亮度的顶夸克数据集,分别约束大x胶子PDF与25个顶夸克相互作用的SMEFT威尔逊系数,通过SIMUnet实现二者联合测定,并给出区分BSM信号与QCD效应的方法。

摘要:

我们评估了大型强子对撞机(LHC)上的顶夸克产生对部分子分布函数(PDFs)和标准模型有效场论(SMEFT)中威尔逊系数全局分析的影响,评估分别在单独分析和联合解释框架下开展。我们采用了迄今最广泛的顶夸克数据集,其中包含基于完整Run II积分亮度的所有可用测量结果。首先,我们确定了该数据集对大x区域胶子PDF的约束,并研究了其与其他对胶子敏感的测量结果的一致性。其次,我们使用最先进的标准模型(SM)和有效场论(EFT)理论计算,对同一数据集进行了SMEFT解释,得到了对25个修正顶夸克相互作用的威尔逊系数的限制。随后,我们将这两项分析整合到SIMUnet方法中,实现了SMEFT PDFs和EFT系数的同时测定,并确定了参数空间中二者相互作用在现象学上最具相关性的区域。我们还展示了在解释LHC顶夸克测量结果时,如何将可能的超出标准模型(BSM)信号与量子色动力学(QCD)效应区分开来。

英文摘要:

We assess the impact of top quark production at the LHC on global analyses of parton distributions (PDFs) and of Wilson coefficients in the SMEFT, both separately and in the framework of a joint interpretation. We consider the broadest top quark dataset to date containing all available measurements based on the full Run II luminosity. First, we determine the constraints that this dataset provides on the large-x gluon PDF and study its consistency with other gluon-sensitive measurements. Second, we carry out a SMEFT interpretation of the same dataset using state-of-the-art SM and EFT theory calculations, resulting in bounds on 25 Wilson coefficients modifying top quark interactions. Subsequently, we integrate the two analyses within the SIMUnet approach to realise a simultaneous determination of the SMEFT PDFs and the EFT coefficients and identify regions in the parameter space where their interplay is most phenomenologically relevant. We also demonstrate how to separate eventual BSM signals from QCD effects in the interpretation of top quark measurements at the LHC.

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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