Leif Gellersen, Stefan Prestel, Michael Spannowsky
SciPost Phys. 13, 034 (2022) ·
published 26 August 2022
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· pdf
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. The resulting simulation indicates that
QCD/QED interference effects are small for a simple test case and dwarfed by
electro-weak resonance effects.
