Abstract
Triple gauge boson hadroproduction, in particular the production of three $W$-bosons at the LHC, is considered at next-to leading order accuracy in QCD. The NLO matrix elements are combined with parton showers. Multijet merging is invoked such that NLO matrix elements with one additional jet are also included. The studies here incorporate both the signal and all relevant backgrounds for $VH$ production with the subsequent decay of the Higgs boson into $W$-- or $\tau$--\-pairs. They have been performed using \SherpaOpenLoops in combination with Collier.
Highlights
The imminent second round of data taking at the LHC presents new opportunities for studying physics at the electroweak to TeV scale
There are current efforts from both CMS and ATLAS to search for the trilepton (l = e, μ) final states emerging from W H–associated production, where the Higgs boson decays either into τ or W pairs [11,12,13]2
The Z veto is very important in these analyses, as without it the W ±Z process is very dominant over both the signal and the background, while without the jet veto top associated vector boson production would bury the Higgs processes
Summary
The imminent second round of data taking at the LHC presents new opportunities for studying physics at the electroweak to TeV scale. The studies presented here follow closely the recent analyses by ATLAS and CMS [11,12,13] In many of these processes, QCD corrections play a significant role, from highly phase-space dependent K-factors ranging between 1.5 and 2 to the fact that the emergence of additional jets can be used to shed light on the actual production mechanism giving rise to triple gauge boson final states. A multijet merging with NLO matrix elements including one additional jet is included, following the MEPS@NLO algorithm [43, 44] This method has recently been employed for a number of processes, among them top pair production with up to two jets [45, 46], Higgs production in gluon fusion with up to two jets [47] and, the production of 4 leptons in association with up to one jet [48]1.
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