Speaker
Dr
Francesco Giuli
(Istituto Nazionale di Fisica Nucleare)
Description
We investigate the impact of recently computed N$^{3}$LO corrections to QCD splitting and DIS coefficient functions on global fits of Parton Distribution Functions (PDF) using the xFitter framework. By comparing fits performed at different perturbative orders, we analyze the modifications introduced to PDFs and their associated uncertainties, incorporating correlated experimental errors. Additionally, the effects of various approximations for splitting functions are assessed, providing a basis for estimating theoretical uncertainties. The results show the importance of the N$^{3}$LO corrections and the need for further theoretical refinement in the low-$x$ regime.
Author
Dr
Francesco Giuli
(Istituto Nazionale di Fisica Nucleare)
