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Coloring mixed QCD/QED evolution

Gellersen, Leif; Prestel, Stefan; Spannowsky, Michael

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Leif Gellersen

Stefan Prestel


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 NC=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.


Gellersen, L., Prestel, S., & Spannowsky, M. (2022). Coloring mixed QCD/QED evolution. SciPost Physics, 13(2),

Journal Article Type Article
Acceptance Date Jul 6, 2022
Online Publication Date Aug 26, 2022
Publication Date 2022
Deposit Date Dec 5, 2022
Publicly Available Date Dec 5, 2022
Journal SciPost Physics
Print ISSN 2542-4653
Publisher SciPost
Peer Reviewed Peer Reviewed
Volume 13
Issue 2


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