TTP09-05 Quark and gluon form factors to three loops

TTP09-05 Quark and gluon form factors to three loops

TTP09-05 Quark and gluon form factors to three loops

We compute the form factors of the photon-quark-anti-quark vertex and the effective vertex of a Higgs boson and two gluons to three-loop order within massless perturbative Quantum Chromodynamics. These results provide building blocks for many third-order cross sections. Furthermore, this is the first calculation of complete three-loop vertex corrections.

P.A. Baikov, K.G. Chetyrkin, A.V. Smirnov, V.A. Smirnov, M. Steinhauser
Phys.Rev.Lett. 102 212002 2009
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