Nuclear parton distribution functions and their uncertainties
Nuclear parton distribution functions and their uncertainties
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DOI：
10.1103/physrevc.70.044905
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发表时间：
2004-04
影响因子：
3.1
通讯作者：
M. Hirai;Shunzo Kumano;T. Nagai
中科院分区：
文献类型：
--
作者：
M. Hirai;Shunzo Kumano;T. Nagai
我们分析核结构-功能比 F{sub 2}{sup A}/F{sub 2}{sup A{sup '}} 和 Drell-Yan 截面比的实验数据，以获得核中的最佳部分子分布函数 (PDF)。然后，通过 Hessian 方法估计核 PDF 的不确定性。价夸克分布由大 x 处的 F{sub 2} 数据确定；然而，小x部分从数据来看并不明显。另一方面，F{sub 2} 数据在 x{approx}0.01 处以及 Drell-Yan 数据在 x{approx}0.1 处很好地确定了反夸克分布；然而，large-x 的行为尚不清楚。胶子分布不能由现有数据确定，并且在整个 x 区域具有很大的不确定性。参数化结果与数据进行比较。我们提供了一个有用的代码，用于计算给定 x 和 Q{sup 2} 处的核 PDF。
We analyze experimental data of nuclear structure-function ratios F{sub 2}{sup A}/F{sub 2}{sup A{sup '}} and Drell-Yan cross section ratios for obtaining optimum parton distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear PDFs are estimated by the Hessian method. Valence-quark distributions are determined by the F{sub 2} data at large x; however, the small-x part is not obvious from the data. On the other hand, the antiquark distributions are determined well at x{approx}0.01 from the F{sub 2} data and at x{approx}0.1 by the Drell-Yan data; however, the large-x behavior is not clear. Gluon distributions cannot be fixed by the present data and they have large uncertainties in the whole x region. Parametrization results are shown in comparison with the data. We provide a useful code for calculating nuclear PDFs at given x and Q{sup 2}.