New results on small-x resummation for splitting functions
High Energy Physics - Phenomenology
2026-03-04 v1
Abstract
We revisit the basic steps necessary to obtain next-to-leading-logarithmic accurate small- results for the DGLAP splitting functions, and their implementations within the HELL framework. We derive new analytical all-order results for the leading-logarithmic anomalous dimension, the and finite Green functions, and most importantly for the anomalous dimension, which allows us to arrive for the first time at a properly resummed splitting kernel. We use these results as cornerstones of a new implementation of small- splitting-function resummation which is more solid and numerically better behaved with respect to those available thus far. All of these novelties are included in the upcoming 4.0 version of HELL.
Cite
@article{arxiv.2603.02312,
title = {New results on small-x resummation for splitting functions},
author = {Marco Bonvini and Stefano Frixione and Giovanni Stagnitto},
journal= {arXiv preprint arXiv:2603.02312},
year = {2026}
}