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arXiv 2406.01779hep-ph
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NNPDF4.0 aN$^3$LO PDFs 及 QED 修正

NNPDF4.0 aN$^3$LO PDFs with QED corrections

Andrea Barontini, Niccolo Laurenti, Juan Rojo

AI总结:

本文回顾了 NNPDF 框架内质子共线部分子分布的进展,结合 QED 修正、缺失高阶不确定性处理及近似 N$^3$LO QCD 计算,提出了包含光子 PDF 的 NNPDF4.0 aN$^3$LO 变体,并与 MSHT 组结果对比,量化了其对 LHC 截面的影响。

摘要:

我们回顾了在 NNPDF 框架内确定质子共线部分子分布(PDFs)的全球性进展。该进展包括包含 QED 效应的 NNPDF4.0 变体、通过理论协方差矩阵形式化处理缺失高阶不确定性(MHOUs)的变体,以及基于近似 N$^3$LO(aN$^3$LO)精度 QCD 计算的 PDFs。我们展示了这些理论发展的结合,生成了考虑 QED 修正并包含光子 PDF 的 NNPDF4.0 aN$^3$LO 变体。我们将这些 aN$^3$LO QED PDFs 与 MSHT 组获得的类似结果进行了比较,并简要量化了它们在代表性 LHC 截面层面的影响。

英文摘要:

We review recent progress in the global determination of the collinear parton distributions (PDFs) of the proton within the NNPDF framework. This progress includes NNPDF4.0 variants with QED effects and with missing higher order uncertainties (MHOUs) via the theory covariance matrix formalism, as well as PDFs based on QCD calculations at approximate N$^3$LO (aN$^3$LO) accuracy. We present the combination of these theoretical developments resulting into NNPDF4.0 aN$^3$LO variants accounting for QED corrections and with a photon PDF. We compare these aN$^3$LO QED PDFs with analogous results obtained by the MSHT group, and briefly quantify their implications at the level of representative LHC cross-sections.

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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