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Improved approximations for the three-loop splitting functions in QCD

2000; Elsevier BV; Volume: 490; Issue: 1-2 Linguagem: Inglês

10.1016/s0370-2693(00)00953-9

ISSN

1873-2445

Autores

W.L. van Neerven, A. Vogt,

Tópico(s)

Quantum Chromodynamics and Particle Interactions

Resumo

We update our approximate parametrizations of the three-loop splitting functions for the evolution of unpolarized parton densities in perturbative QCD. The new information taken into account is given by the additional Mellin moments recently calculated by Retey and Vermaseren. The inclusion of these constraints reduces the uncertainties of our approximations considerably and extends their region of applicability by about one order of magnitude to lower momentum fractions x.

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