München 2009 – scientific programme
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T: Fachverband Teilchenphysik
T 12: QCD (Theorie) 2
T 12.8: Talk
Tuesday, March 10, 2009, 18:30–18:45, M109
NLO QCD corrections to W pair production at hadron colliders — Stefan Dittmaier1, •Stefan Kallweit1,2, and Peter Uwer3 — 1Max-Planck-Institut für Physik, München — 2Paul-Scherrer-Institut, Villigen — 3Humboldt-Universität, Berlin
We report on the calculation of the next-to-leading-order QCD corrections to the production of W-boson pairs in association with a hard jet at the Tevatron and the LHC, which is an important source of background for Higgs and new-physics searches.
The corrections stabilize the leading-order prediction for the cross section considerably, in particular if a veto against the emission of a second hard jet is applied.
Leptonic decays of the W bosons are included by applying an improved version of the narrow-width approximation that treats the W bosons as on-shell particles, but keeps the W-spin information to improve the decay description.
A survey of differential NLO QCD cross sections is discussed both for the LHC and the Tevatron. Aside from a general overestimation of cross sections for high transverse momenta by the leading-order description, the phase-space dependence of the corrections turns out to be only moderate.