Space-like splitting functions

Topics
	Longitudinally polarised splitting functions
	Transversely polarised splitting functions
	Unpolarised splitting functions

Detailed Description

Collection of the MSbar space-like splitting functions up to the highest order currently known for unpolarised, polarised, and transversity evolution.

Note

While for the O(α_s) and O(α_s²) splitting functions exact expressions are used, a fast parameterisation for the O(α_s³) (and O(α_s⁴) when available) ones is used. See https://www.liverpool.ac.uk/~avogt/split.html for more details. Approximated O(α_s⁴) splitting functions are taken from: https://github.com/MSHTPDF/N3LO_additions and best fit parameters taken from Table 8 of https://arxiv.org/pdf/2207.04739.pdf.