Merging weak and QCD showers with matrix elements

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.

18 pages, 9 figures

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• Probing Dark Matter with Disappearing Tracks at the LHC
• Collinear Electroweak Radiation in Antenna Parton Showers
• Z/gamma* plus Multiple Hard Jets in High Energy Collisions
• A Positive Resampler for Monte Carlo Events with Negative Weights
• Combining states without scale hierarchies with ordered parton showers
• Measurement of $W$ boson angular distributions in events with high transverse momentum jets at $\sqrt{s}=$ 8 TeV using the ATLAS detector
• Constraining rare B decays by ${\mu }^{+}{\mu }^{-}\to tc$ at future lepton colliders
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Cross-section measurements for the production of a $Z$ boson in association with high-transverse-momentum jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Scale and Scheme Variations in Unitarized NLO Merging
• Towards a Fully Automated Differential ${\text{NNLO}}_{\text{EW}}$ Generator for Lepton Colliders