NLO QCD corrections to \(pp/p\bar{p}\rightarrow WW+jet+X\) including leptonic W-boson decays. (English) Zbl 1203.81174
Summary: 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 approximationthat 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 \(\mathbf t\bar{t}\) 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.
MSC:
| 81V05 | Strong interaction, including quantum chromodynamics |
| 81V35 | Nuclear physics |
| 81U35 | Inelastic and multichannel quantum scattering |
| 81U99 | Quantum scattering theory |
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