Description
When parton momentum faction 𝑥 of hadron becomes small, an enhancement from small-𝑥 logarithms shows up, and eventually, we enter into a partonic saturation region. A consistent treatment of the small-𝑥 logarithms requires an all-order resummation which can be achieved with the BFKL formalism. However, a boundary to delineate the small-𝑥 resummation region from saturation one is ambiguous. In this study, we take a 𝑥-dependent DIS scale motivated by the saturation model in a global analysis, which improves the QCD description of the HERA DIS data. In parallel, we also explore the BFKL improved DGLAP evolution, which achieves a similar 𝜒2 for the same data set. We compare various impacts of these two methods on the parton distributions, and also phenomenological implications, including Drell-Yan or Higgs boson production at future hadron colliders (FCC), the ultra-high-energy neutrino-nucleus scattering, and structure function measurements at future electron-hadron colliders (LHeC/FCC-eh).
