Merging weak and QCD showers with matrix elements

TL;DR

This paper introduces a new method for combining weak boson radiation with QCD radiation in particle collision simulations, improving accuracy and consistency in event generation for collider physics.

Contribution

It develops a novel merging strategy that integrates electroweak and QCD calculations within PYTHIA, enhancing simulation fidelity for collider experiments.

Findings

Improved agreement with LHC data using the new merging method.

Enhanced predictions for future 100 TeV collider scenarios.

Demonstrated reduction of inconsistencies in combined radiation simulations.

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.