Coloring mixed QCD/QED evolution

Understand

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 $N_C=3$ color configurations to embed interference.