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 PDF PostScript arXiv