论文标题
核部分分布在一般质量变化数量方案中具有不确定性的功能
Nuclear parton distribution functions with uncertainties in a general mass variable flavor number scheme
论文作者
论文摘要
在本文中,我们以近代领先的顺序获得了一组新的核部分分布函数(核PDF),并在扰动QCD中获得临近临时的序列准确性。我们研究中分析的常见的核深弹性散射(DIS)数据与具有核靶标的可用充电中微子数据以及来自Drell-YAN横截面测量的数据相辅相成。此外,我们的数据样本还添加了杰斐逊实验室CLA和C实验的最新DIS数据。对于这些特定的数据集,我们考虑目标质量校正和更高的扭曲效果的影响,这些影响在大型$ x $和中间到最低的$ q^2 $中有望很重要。我们的分析基于公开可用的开源工具{\ tt apfel},该工具已修改为适用于我们对核PDF的分析。在{\ tt fonll}通用质量可变味数份方案的框架内,考虑了对核dis的重夸克的贡献。最新的{\ tt ct18} PDF用作基线质子PDF。核PDF的不确定性是使用标准Hessian方法确定的。我们的全球QCD分析结果与现有的核PDF集和合适的横截面进行了比较,我们的核PDF集提供了很好的描述。
In this article we obtain a new set of nuclear parton distribution functions (nuclear PDFs) at next-to-leading order and next-to-next-to-leading order accuracy in perturbative QCD. The common nuclear deep-inelastic scattering (DIS) data analyzed in our study are complemented by the available charged-current neutrino DIS data with nuclear targets and data from Drell-Yan cross-section measurements for several nuclear targets. In addition, the most recent DIS data from the Jefferson Lab CLAS and Hall C experiments are also added to our data sample. For these specific datasets, we consider the impact of target mass corrections and higher twist effects which are expected to be important in the region of large $x$ and intermediate-to-low $Q^2$. Our analysis is based on a publicly available open-source tool {\tt APFEL}, which has been modified to be applicable for our analysis of nuclear PDFs. Heavy quark contributions to nuclear DIS are considered within the framework of the {\tt FONLL} general-mass variable-flavor-number scheme. The most recent {\tt CT18} PDFs are used as baseline proton PDFs. The uncertainties of nuclear PDFs are determined using the standard Hessian approach. The results of our global QCD analysis are compared with existing nuclear PDF sets and with the fitted cross-sections, for which our set of nuclear PDFs provides a very good description.