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Collider events on a quantum computer

Gustafson, Gösta; Prestel, Stefan; Spannowsky, Michael; Williams, Simon

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Gösta Gustafson

Stefan Prestel

Simon Williams


An intuitive definition of the partonic flavor of a jet in quantum chromodynamics is often only well-defined in the deep ultraviolet, where the strong force becomes a free theory and a jet consists of a single parton. However, measurements are performed in the infrared, where a jet consists of numerous particles and requires an algorithmic procedure to define their phase space boundaries. To connect these two regimes, we introduce a novel and simple partonic jet flavor definition in the infrared. We define the jet flavor to be the net flavor of the partons that lie exactly along the direction of the Winner-Take-All recombination scheme axis of the jet, which is safe to all orders under emissions of soft particles, but is not collinear safe. Collinear divergences can be absorbed into a perturbative fragmentation function that describes the evolution of the jet flavor from the ultraviolet to the infrared. The evolution equations are linear and a small modification to traditional DGLAP and we solve them to leading-logarithmic accuracy. The evolution equations exhibit fixed points in the deep infrared, we demonstrate quantitative agreement with parton shower simulations, and we present various infrared and collinear safe observables that are sensitive to this flavor definition.


Gustafson, G., Prestel, S., Spannowsky, M., & Williams, S. (2022). Collider events on a quantum computer. Journal of High Energy Physics, 2022(11), Article 35.

Journal Article Type Article
Acceptance Date Oct 27, 2022
Online Publication Date Nov 7, 2022
Publication Date 2022
Deposit Date Jan 16, 2023
Publicly Available Date Jan 16, 2023
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2022
Issue 11
Article Number 35


Published Journal Article (879 Kb)

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Copyright Statement
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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