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arXiv 1403.2113hep-ph
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通过不同QCD阶之间的连接公式改进首阶的价PDF

Improved valence PDFs at leading order via connection formulas between the different QCD orders

O. Yu. Shevchenko, R. R. Akhunzyanov

摘要:

直接连接部分子分布函数(PDF)在领先(LO)和下一个领先(NLO)QCD订单适用于非极化和极化价PDF和产生改进的LO结果对这些数量没有排除从分析的数据来自小和中等$Q^2$区域。结果表明,以这种方式推导和本文中提出的改进的LO参数化的价PDF可以在标准的LO分析中,通过只使用在非常高的$Q^2$值(这是几乎不可能的,在现实中)产生的数据,他们强烈不同于原始的LO参数化的这些数量,通过使用大部分的数据产生在小和中等的$Q^2$值。有人认为,即使相应的NLO结果仍然不可用,也可以显着改善PDF上的LO结果。

英文摘要:

The formulas directly connecting parton distribution functions (PDFs) at the leading (LO) and the next to leading (NLO) QCD orders are applied to both unpolarized and polarized valence PDFs and produce improved LO results on these quantities without exclusion from the analysis the data coming from the small and moderate $Q^2$ region. It is shown that derived in this way and presented in the paper improved LO parametrizations of the valence PDFs could be obtained within the standard LO analysis by using only the data produced at very high $Q^2$ values (that is hardly possible in reality) and they strongly differ from the original LO parametrizations of these quantities, obtained by using the most of data produced at small and moderate $Q^2$ values. It is argued that LO results on PDFs can be significantly improved even if the respective NLO results are still unavailable.

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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