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arXiv 1507.01006hep-phhep-ex
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具有阈值重算的部分子分布

Parton distributions with threshold resummation

Marco Bonvini, Simone Marzani, Juan Rojo, Luca Rottoli, Maria Ubiali, Richard D. Ball, Valerio Bertone, Stefano Carrazza, Nathan P. Hartland

摘要:

我们构造了一组部分子分布函数(PDF),其中固定阶NLO和NNLO计算分别补充了NLL和NNLL精度的软胶子(阈值)重算,适用于与任何QCD计算结合使用,其中阈值重算包括在部分子截面的水平。这些基于NNPDF3.0分析的图解PDF集是从深度非弹性散射、Drell-Yan和顶夸克对产生数据中提取的,可以一致地使用图解计算。我们发现,接近阈值,列入的dummed PDF可以部分补偿的增强dummed矩阵元素,导致dummed强子截面更接近固定阶计算。另一方面,远离阈值,简化的PDF减少到它们的固定顺序对应物。我们的研究结果表明,需要一致使用的mammed PDF在mammed计算。

英文摘要:

We construct a set of parton distribution functions (PDFs) in which fixed-order NLO and NNLO calculations are supplemented with soft-gluon (threshold) resummation up to NLL and NNLL accuracy respectively, suitable for use in conjunction with any QCD calculation in which threshold resummation is included at the level of partonic cross sections. These resummed PDF sets, based on the NNPDF3.0 analysis, are extracted from deep-inelastic scattering, Drell-Yan, and top quark pair production data, for which resummed calculations can be consistently used. We find that, close to threshold, the inclusion of resummed PDFs can partially compensate the enhancement in resummed matrix elements, leading to resummed hadronic cross-sections closer to the fixed-order calculation. On the other hand, far from threshold, resummed PDFs reduce to their fixed-order counterparts. Our results demonstrate the need for a consistent use of resummed PDFs in resummed calculations.

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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