Three-loop off-forward evolution kernel for axial-vector operators in Larin's scheme

Abstract

Evolution equations for leading twist operators in high orders of perturbation theory can be restored from the spectrum of anomalous dimensions and the calculation of the special conformal anomaly at one order less using conformal symmetry of QCD at the Wilson-Fisher critical point at non-integer $d=4-2\epsilon$ space-time dimensions. In this work we generalize this technique to axial-vector operators. We calculate the corresponding three-loop evolution kernels in Larin's scheme and derive explicit expressions for the finite renormalization kernel that describes the difference to the vector case to restore the conventional $\overline{\mathrm{MS}}$-scheme. The results are directly applicable to deeply-virtual Compton scattering and the transition form factor ${\gamma }^{\ast }\gamma \to \pi$.

arXiv comment9 pages

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Cited by in corpus (2)

• The axial-vector contributions in two-photon reactions: pion transition form factor and deeply-virtual Compton scattering at NNLO in QCD
• Resummation of threshold logarithms in deeply-virtual Compton scattering