利用包容性深度非弹性散射和质子-质子碰撞数据同时提取顶夸克质量、强耦合、有效混合角和质子部分子分布函数
Simultaneous extraction of top quark mass, strong coupling, effective mixing angle, and proton PDFs using inclusive DIS and proton-proton collision data
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中文总结 AI 辅助
首次利用HERA深度非弹性散射及LHC质子碰撞数据，在QCD次下领先阶用xFitter框架同时确定质子PDFs、强耦合、顶夸克质量和有效弱混合角，还约束了相关算符，为LHC数据全局解释奠定基础。
中文摘要 AI 辅助
我们首次同时确定了质子部分子分布函数（PDFs）以及强耦合、顶夸克极点质量和有效弱混合角。该分析在 QCD 中次下领先阶进行，使用 xFitter 框架，基于 HERA 的包容性深度非弹性散射测量以及 LHC 质子-质子碰撞中喷注、电弱玻色子和顶夸克-反夸克对产生的精确测量。考虑了顶夸克-反夸克对产生中的非相对论 QCD 效应至次领先阶，并与次领先对数软胶子重整化相结合。同时对 PDFs 和标准模型（SM）参数以及相关顶夸克 SM 有效场论（SMEFT）算符进行了约束。所得 SM 参数的精度与当前最先进的单独提取结果具有竞争力，并考虑了这些参数与 PDFs 之间的相关性。这项工作为未来根据 QCD、SM 和 SMEFT 对 LHC 数据进行全局解释铺平了道路。
英文摘要
We present the first simultaneous determination of the proton parton distribution functions (PDFs) together with the strong coupling, the top quark pole mass, and the effective weak mixing angle. The analysis is performed at next-to-next-to-leading order in QCD using the xFitter framework, based on inclusive deep-inelastic scattering measurements at HERA and precise measurements of jet, electroweak boson, and top quark-antiquark pair production in proton-proton collisions at the LHC. Non-relativistic QCD effects in top quark-antiquark pair production are considered at next-to-leading order, and combined with next-to-leading logarithmic soft-gluon resummation. Simultaneously with PDFs and Standard Model (SM) parameters, relevant top quark SM effective-field-theory (SMEFT) operators are constrained. The precision of the obtained SM parameters is competitive with the state-of-the art individual extractions and accounts for the correlations among those parameters and PDFs. This work paves the way for future global interpretation of the LHC data in terms of QCD, SM and SMEFT.
