DE FLORIAN daniel Enrique
Gluon Induced Contributions to WZ and WGamma Production at NNLO
KATE ADAMSON; DANIEL DE FLORIAN; ADRIAN SIGNER
PHYSICAL REVIEW D - PARTICLE AND FILDS
American Physical Society
Lugar: New York; Año: 2002 vol. 65 p. 9404 - 9404
We calculate the contribution of the partonic processes gg→WZ and gg→WGamma to WZ and WGamma pair production at hadron colliders, including anomalous triple gauge-boson couplings. We use the helicity method and include the decay of the W and Z bosons into leptons in the narrow-width approximation. In order to integrate over the q ̄q final state phase space we use an extended version of the subtraction method to NNLO and remove collinear singularities explicitly. Because of the large gluon density at low x, the gluon induced terms of vector-boson pair production are expected to be the dominant NNLO QCD correction, relevant at CERN LHC energies. However, we show that due to a cancellation they turn out to provide a rather small contribution, anticipating good stability for the perturbative expansion.