https://doi.org/10.1140/epjc/s10052-023-11778-3
Special Article - Tools for Experiment and Theory
A spatially constrained QCD colour reconnection in 
, 
, and 
collisions in the Pythia8/Angantyr model
Department of Physics, Lund University, Sölvegatan 14A, 223 62, Lund, Sweden
Received:
28
March
2023
Accepted:
28
June
2023
Published online:
6
July
2023
We present an updated version of the QCD-based colour reconnection model in Pythia8, where we constrain the range in impact parameter for which reconnections are allowed. In this way, we can introduce more realistic colour reconnections in the Angantyr model for heavy ion collisions, where previously only reconnections within separate nucleon sub-collisions have been allowed. We investigate how the new impact parameter constraint influences final states in collisions, and retune parameters of the multi-parton interaction parameters in Pythia to compensate so that minimum bias data are reproduced. We also study multiplicity distributions in collisions and find that, in order to counteract the loss in multiplicity due to the introduction of global colour reconnections, we need to modify some parameters in the Angantyr model while keeping the parameters tuned to fixed. With Angantyr we can then extrapolate to collisions without further parameter tuning and retaining a reasonable description of the basic multiplicity distributions.
The original online version of this article was revised: In this article the author name Leif Lönnblad was incorrectly written as Leif Lönblad.
An erratum to this article is available online at https://doi.org/10.1140/epjc/s10052-023-11816-0.
Copyright comment corrected publication 2023
© The Author(s) 2023. corrected publication 2023
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