arXiv 2103.086062021-03-15hep-phhep-ex

部分子分布的未来检验

Future tests of parton distributions

Juan Cruz-Martinez, Stefano Forte, Emanuele R. Nocera

备注：: 29 pages, 7 figures. Prepared for the 60th anniversary of the Cracow School of Theoretical Physics, to be published in the proceedings
DOI：: 10.5506/APhysPolB.52.243

摘要：

我们讨论了测试的泛化能力的方法中使用的部分子分布函数（PDF）的测定。"未来测试"检查PDF上的不确定性，在不受当前数据约束的区域中，是否与未来数据兼容。通过使用当前优化的PDF测定方法进行测试，但使用过去可用的有限数据集，并通过检查结果是否在不确定性范围内与使用当前更广泛的数据集发现的结果兼容。我们使用未来的测试来评估NNPDF4.0非极化PDF和NNPDFpol1.1极化PDF方法的泛化能力。具体来说，我们调查是否前者将预测上升的非极化质子结构功能$F_2$在小$x$仅使用前HERA数据，以及是否后者将预测所谓的"质子自旋危机"仅使用前EMC数据。

英文摘要：

We discuss a test of the generalization power of the methodology used in the determination of parton distribution functions (PDFs). The "future test" checks whether the uncertainty on PDFs, in regions in which they are not constrained by current data, are compatible with future data. The test is performed by using the current optimized methodology for PDF determination, but with a limited dataset, as available in the past, and by checking whether results are compatible within uncertainty with the result found using a current more extensive dataset. We use the future test to assess the generalization power of the NNPDF4.0 unpolarized PDF and the NNPDFpol1.1 polarized PDF methodology. Specifically, we investigate whether the former would predict the rise of the unpolarized proton structure function $F_2$ at small $x$ using only pre HERA data, and whether the latter would predict the so-called "proton spin crisis" using only pre-EMC data.

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