NLO QCD corrections to pp/ppbar --> WW+jet+X including leptonic W-boson decays

Details NLO QCD corrections to pp/ppbar --> WW+jet+X including leptonic W-boson decays NLO QCD corrections to pp/ppbar --> WW+jet+X including leptonic W-boson decays

2009-08-28

arxiv.org/abs/0908.4124v1

Nucl.Phys.B826:18-70,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

56 pages, 46 figures, 25 tables

Scientific paper

10.1016/j.nuclphysb.2009.09.029

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. 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 information on the W spin. Contributions from external bottom quarks are neglected, because they are either numerically suppressed or should be attributed to different processes such as Wt or ttbar production. A survey of differential NLO QCD cross sections is provided both for the LHC and the Tevatron. The QCD corrections stabilize the leading-order prediction for the cross section with respect to scale variations. However, the scale dependence of the next-to-leading order results for the LHC is only reduced considerably if a veto against the emission of a second hard jet is applied. In general, the corrections do not simply rescale the differential leading-order cross sections. In particular, their shapes are distorted if an additional energy scale is involved.

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