Four-loop splitting functions in QCD -- The gluon-gluon case --
Abstract
We have computed the even-N moments N =< 20 of the gluon-gluon splitting function P_{gg} at the fourth order of perturbative QCD via the renormalization of off-shell operator matrix elements. Our results, derived analytically for a general compact simple gauge group, agree with all results obtained for this function so far, in particular with the lowest five moments obtained via structure functions in deep-inelastic scattering. Using our new moments and all available endpoint constraints, we construct improved approximations for the four-loop P_{gg}(x) that should be sufficient for a wide range of collider-physics applications. The N^3LO contributions to the scale derivative of the gluon distribution, resulting from these and the corresponding quark-to-gluon splitting functions, amount to 1% or less at x >~ 10^{-4} at a standard reference scale with alpha_s = 0.2.
Cite
@article{arxiv.2410.08089,
title = {Four-loop splitting functions in QCD -- The gluon-gluon case --},
author = {G. Falcioni and F. Herzog and S. Moch and A. Pelloni and A. Vogt},
journal= {arXiv preprint arXiv:2410.08089},
year = {2024}
}
Comments
15 pages, LaTeX, 3 figures, 2 ancillary files (FORM file with results and FORTRAN subroutine). arXiv admin note: text overlap with arXiv:2404.09701