Abstract
We have computed the self-energies and a set of three-particle vertex functions for massless QCD at the four-loop level in the \( \overline{\mathrm{MS}} \) renormalization scheme. The vertex functions are evaluated at points where one of the momenta vanishes. Analytical results are obtained for a generic gauge group and with the full gauge dependence, which was made possible by extensive use of the Forcer program for massless four-loop propagator integrals. The bare results in dimensional regularization are provided in terms of master integrals and rational coefficients; the latter are exact in any space-time dimension. Our results can be used for further precision investigations of the perturbative behaviour of the theory in schemes other than \( \overline{\mathrm{MS}} \). As an example, we derive the five-loop beta function in a relatively common alternative, the minimal momentum subtraction (MiniMOM) scheme.
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Ruijl, B., Ueda, T., Vermaseren, J.A.M. et al. Four-loop QCD propagators and vertices with one vanishing external momentum. J. High Energ. Phys. 2017, 40 (2017). https://doi.org/10.1007/JHEP06(2017)040
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DOI: https://doi.org/10.1007/JHEP06(2017)040