Large-<i>n_f</i> contributions to the four-loop splitting functions in QCD

Davies, J, Vogt, A, Ruijl, B, Ueda, T and Vermaseren, JAM (2017) Large-<i>n_f</i> contributions to the four-loop splitting functions in QCD. NUCLEAR PHYSICS B, 915. pp. 335-362.

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Abstract

We have computed the fourth-order nf^2 contributions to all three non-singlet quark-quark splitting functions and their four nf^3 flavour-singlet counterparts for the evolution of the parton distributions of hadrons in perturbative QCD with nf effectively massless quark flavours. The analytic form of these functions is presented in both Mellin N-space and momentum-fraction x-space; the large-x and small-x limits are discussed. Our results agree with all available predictions derived from lower-order information. The large-x limit of the quark-quark cases provides the complete nf^2 part of the four-loop cusp anomalous dimension which agrees with two recent partial computations.

Item Type:	Article
Additional Information:	29 pages, Latex, 8 figures. FORM files of the main results available with the source
Uncontrolled Keywords:	hep-ph, hep-ph
Depositing User:	Symplectic Admin
Date Deposited:	12 Apr 2017 07:46
Last Modified:	12 Oct 2023 13:50
DOI:	10.1016/j.nuclphysb.2016.12.012
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3006953