https://doi.org/10.1140/epjc/s10052-024-12760-3
Regular Article - Theoretical Physics
Non-relativistic quantum chromodynamics in parton showers
1
School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
2
Department of Physics, University of Cincinnati, 45221, Cincinnati, OH, USA
3
Department of Physics, Lund University, 221 00, Lund, Sweden
4
Fermi National Accelerator Laboratory, 60510, Batavia, IL, USA
Received:
23
January
2024
Accepted:
5
April
2024
Published online:
25
April
2024
Measurements of quarkonia isolation in jets at the Large Hadron Collider (LHC) have been shown to disagree with fixed-order non-relativistic quantum chromodynamics (NRQCD) calculations, even at higher orders. Calculations using the fragmenting jet function formalism are able to better describe data but cannot provide full event-level predictions. In this work we provide an alternative model via NRQCD production of quarkonia in a timelike parton shower. We include this model in the Pythia 8 event generator and validate our parton-shower implementation against analytic forms of the relevant fragmentation functions. Finally, we make inclusive predictions of quarkonia production for the decay of the standard-model Higgs boson.
© The Author(s) 2024
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