Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-01-29
Nucl.Phys.B629:255-289,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
36 pages, 2 postscript figures, LaTeX, JHEP class
Scientific paper
10.1016/S0550-3213(02)00140-2
We present the NNLO QCD virtual corrections for qurak-antiquark -> gluon photon, quark-antiquark -> photon photon and the NNLO QED virtual corrections for electron positron -> photon photon and all processes related by crossing symmetry. We perform an explicit evaluation of the two-loop diagrams in conventional dimensional regularisation, and our results are renormalised in the MSbar scheme. The infrared pole structure of the amplitudes is in agreement with the prediction of Catani's general formalism for the singularities of two-loop amplitudes, while expressions for the finite remainder are given for all processes in terms of logarithms and polylogarithms that are real in the physical region.
Anastasiou Charalampos
Glover E. W. N.
Tejeda-Yeomans Maria Elena
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