论文标题
考虑XFITTER框架内较高扭曲校正的衍射Parton分布功能的全局QCD分析
A global QCD analysis of diffractive parton distribution function considering higher twist corrections within the xFitter framework
论文作者
论文摘要
我们提出{\ tt skmhs22}，这是一组新的衍射parton分布函数（PDFS）及其在{\ tt xfitter} framework的敏感QCD中的近代级别准确度处的不确定性。我们描述了HERA的所有可用衍射DIS数据集以及考虑三种不同情况的最新高精度H1/ZEUS组合测量结果。首先，考虑到标准扭曲2贡献，我们提取衍射PDF。然后，我们包括纵向虚拟光子的Twist-4校正。最后，还检查了转基航的reggeon交换对结构功能$ f_2^d $的贡献。对于重型口味的贡献，我们利用Thorne-Roberts一般质量变量数方案。我们表明，对于这些校正，尤其是Twist-4的贡献允许包括高$β$区域，并可以更好地描述衍射DIS数据集。我们发现，包含转基因的Reggeon交换可显着改善衍射横截面测量值的描述。所得组与所有分析的衍射DIS数据非常吻合，该数据涵盖了比以前的拟合更宽的运动范围。 {\ tt skmhs22}本工作中介绍的衍射PDFS集可通过{\ tt lhapdf}接口获得。我们还为这一领域的未来研究提出了建议。
We present {\tt SKMHS22}, a new set of diffractive parton distribution functions (PDFs) and their uncertainties at next-to-leading-order accuracy in perturbative QCD within the {\tt xFitter} framework. We describe all available diffractive DIS data sets from HERA and the most recent high-precision H1/ZEUS combined measurements considering three different scenarios. First, we extract the diffractive PDFs considering the standard twist-2 contribution. Then, we include the twist-4 correction from the longitudinal virtual photons. Finally, the contribution of subleading Reggeon exchange to the structure-function $F_2^D$ is also examined. For the contribution of heavy flavors, we utilize the Thorne-Roberts general mass variable number scheme. We show that for those corrections, in particular, the twist-4 contribution allows to include the high-$β$ region and leads to a better description of the diffractive DIS data sets. We find that the inclusion of the subleading Reggeon exchange significantly improves the description of the diffractive DIS cross-section measurements. The resulting sets are in good agreement with all diffractive DIS data analyzed, which cover a wider kinematical range than in previous fits. The {\tt SKMHS22} diffractive PDFs sets presented in this work are available via the {\tt LHAPDF} interface. We also make suggestions for future research in this area.
