Abstract
We present a consistent way of combining associated weak boson radiation in hard dijet events with hard QCD radiation in Drell-Yan-like scatterings. This integrates multiple tree-level calculations with vastly different cross sections, QCD- and electroweak parton shower resummation into a single framework. The new merging strategy is implemented in the PYTHIA event generator and predictions are confronted with LHC data. Improvements over the previous strategy are observed. Results of the new electroweak-improved merging at a future 100 TeV proton collider are also investigated.
Highlights
With the Large Hadron Collider entering its 13 TeV run phase, new phenomena will be investigated in previously inaccessible regions of phase space
We contrast results of the default CKKWL merged prescription in Pythia and the new QCD+EW merging with LHC data
The merging scale was defined as the minimum of all Pythia transverse-momentum separations between partons, while no cut was applied to the W -boson
Summary
With the Large Hadron Collider entering its 13 TeV run phase, new phenomena will be investigated in previously inaccessible regions of phase space. The problems to address in these methods are to ensure that no momentum configurations are over- or under-counted, and that the perturbative accuracy of the fixed-order matrix-element calculation (ME) and parton-shower (PS) resummation merge without either being undermined These obstacles were tackled in matching [2,3,4,5,6,7,8,9,10,11,12,13,14] and merging [15,16,17,18,19,20,21,22,23,24,25] methods, with next-to-next-to-leading order matching [26,27,28,29,30,31] and next-toleading order merging [32,33,34,35,36,37] currently providing the most precise predictions.
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