Title: Impact of low-$x$ resummation on QCD analysis of HERA data Show Chinese title

Title: 低-$x$重新求和对HERA数据QCD分析的影响

Abstract: Fits to the final combined HERA deep-inelastic scattering cross-section data within the conventional DGLAP framework of QCD have shown some tension at low $x$ and low $Q^2$. A resolution of this tension incorporating $\ln(1/x)$-resummation terms into the HERAPDF fits is investigated using the xFitter program. The kinematic region where this resummation is important is delineated. Such high-energy resummation not only gives a better description of the data, particularly of the longitudinal structure function $F_L$, it also results in a gluon PDF which is steeply rising at low $x$ for low scales, $Q^2 \simeq 2.5$ GeV$^2$, contrary to the fixed-order NLO and NNLO gluon PDF. Show Chinese abstract

Abstract: 在QCD的传统DGLAP框架内对最终组合的HERA深度非弹性散射截面数据进行拟合，显示出在低$x$和低$Q^2$处存在一些矛盾。通过将$\ln(1/x)$重求和项纳入HERAPDF拟合中，研究了这种矛盾的解决方法，使用了xFitter程序。确定了这种重求和重要的运动学区域。这种高能重求和不仅更好地描述了数据，特别是纵向结构函数$F_L$，还导致了一个在低$x$处对于低尺度，$Q^2 \simeq 2.5$ GeV$^2$的胶子PDF急剧上升，这与固定阶NLO和NNLO胶子PDF相反。