Abstract
The QCD-induced $W^\pm \gamma$ production channels in association with two jets are computed at next-to-leading order QCD accuracy. The W bosons decay leptonicly and full off-shell and finite width effects as well as spin correlations are taken into account. These processes are important backgrounds to beyond Standard Model physics searches and also relevant to test the nature of the quartic gauge couplings of the Standard Model. The next-to-leading order corrections reduce the scale uncertainty significantly and show a non-trivial phase space dependence. Our code will be publicly available as part of the parton level Monte Carlo program VBFNLO.
Highlights
Di-boson production in association with two jets constitutes an important set of processes at the LHC
The QCD-induced W γ j j production process has been implemented within the VBFNLO framework, a parton level Monte Carlo program which allows the definition of general acceptance cuts and distributions
We found that the new scale choice makes the K -factors decrease well below one with increasing invariant mass or rapidity separation of the two hardest jets
Summary
Di-boson production in association with two jets constitutes an important set of processes at the LHC. The calculation is based on our previous implementation of NLO QCD corrections to W Z j j production processes [22], where the off-shell photon contribution was included. While a similar issue with the charged lepton can be resolved by imposing a simple cut on Rlγ = [(yγ − yl )2 + (φγ − φl )2]1/2 (y and φ being the the rapidity and azimuthal angle, respectively) to separate the photon from the charged lepton, it cannot be applied to partons because doing so would remove events with a soft gluon These events are needed at NLO (or beyond) to cancel soft divergences in the virtual amplitudes. The QCD-induced W γ j j production process has been implemented within the VBFNLO framework, a parton level Monte Carlo program which allows the definition of general acceptance cuts and distributions.
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