Coloring mixed QCD/QED evolution
Leif Gellersen, Stefan Prestel, Michael Spannowsky
TL;DR
This paper develops a sophisticated parton shower simulation including QCD and QED interference effects, finding these effects are small compared to electroweak resonance influences in high-energy physics calculations.
Contribution
It introduces a new parton shower model that incorporates QCD/QED interference with fixed color configurations and matrix element corrections.
Findings
QCD/QED interference effects are small in the tested scenario.
Electroweak resonance effects dominate over interference effects.
The new model improves the accuracy of parton shower simulations.
Abstract
Parton showers are crucial components of high-energy physics calculations. Improving their modelling of QCD is an active research area since shower approximations are stumbling blocks for precision event generators. Naively, the interference between sub-dominant Standard-Model interactions and QCD can be of similar size to subleading QCD corrections. This article assesses the impact of QCD/QED interference effects in parton showers, by developing a sophisticated shower including QED, QCD at fixed color, and employing complete tree-level matrix element corrections for individual color configurations to embed interference. The resulting simulation indicates that QCD/QED interference effects are small for a simple test case and dwarfed by electro-weak resonance effects.
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