A unified NLO description of top-pair and associated Wt production

Abstract

We present an NLO simulation of WWbb production with massive b-quarks at the LHC. Off-shell and non-resonant contributions associated with top-pair and single-top channels and with leptonic W-boson decays are consistently taken into account using the complex-mass scheme. Thanks to the finite b-quark mass, WWbb predictions can be extended to the whole b-quark phase space, thereby including Wt-channel single-top contributions that originate from collinear g->bb splittings in the four-flavour scheme. This provides a consistent NLO description of tt and Wt production and decay, including quantum interference effects. The simulation is also applicable to exclusive 0- and 1-jet bins, which is of great importance for Higgs-boson studies in the H->WW channel and for any other analysis with large top backgrounds and jet vetoes or jet bins.

8pp. Minor revision, results unchanged

References in corpus (4)

• Event generation with SHERPA 1.1
• Scalar one-loop 4-point integrals
• Automating dipole subtraction for QCD NLO calculations
• NLO QCD corrections to WWbb production at hadron colliders

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