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A spacetime model for the perturbative swing

Lundberg, Torbjörn LU orcid and Lönnblad, Leif LU orcid (2025) In European Physical Journal C 85(10).
Abstract

We present the development of a new colour reconnection model in Pythia where the full spacetime separation between partons constrains the reconnection probability throughout the final-state radiative shower. Building upon previous ideas of a perturbative dipole-based model, our objective is to introduce realistic spatially-based colour reconnections within the Angantyr model for heavy-ion collisions. Previous models were limited to the use of a rudimentary separation measure in the transverse plane to control reconnections. We investigate the impact of this novel scheme on final states in e+e-, pp, and pPb collisions as well as in PbPb collision systems and our main goal in this paper is to achieve a reasonable description of basic... (More)

We present the development of a new colour reconnection model in Pythia where the full spacetime separation between partons constrains the reconnection probability throughout the final-state radiative shower. Building upon previous ideas of a perturbative dipole-based model, our objective is to introduce realistic spatially-based colour reconnections within the Angantyr model for heavy-ion collisions. Previous models were limited to the use of a rudimentary separation measure in the transverse plane to control reconnections. We investigate the impact of this novel scheme on final states in e+e-, pp, and pPb collisions as well as in PbPb collision systems and our main goal in this paper is to achieve a reasonable description of basic multiplicities in systems of varying sizes.

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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C
volume
85
issue
10
article number
1139
publisher
Springer Nature
external identifiers
  • scopus:105019060507
ISSN
1434-6044
DOI
10.1140/epjc/s10052-025-14864-w
language
English
LU publication?
yes
additional info
Publisher Copyright: © The Author(s) 2025.
id
20673904-5e4d-41fd-8487-e2b7071d2c6f
date added to LUP
2025-12-01 15:11:30
date last changed
2025-12-02 13:44:30
@article{20673904-5e4d-41fd-8487-e2b7071d2c6f,
  abstract     = {{<p>We present the development of a new colour reconnection model in Pythia where the full spacetime separation between partons constrains the reconnection probability throughout the final-state radiative shower. Building upon previous ideas of a perturbative dipole-based model, our objective is to introduce realistic spatially-based colour reconnections within the Angantyr model for heavy-ion collisions. Previous models were limited to the use of a rudimentary separation measure in the transverse plane to control reconnections. We investigate the impact of this novel scheme on final states in e+e-, pp, and pPb collisions as well as in PbPb collision systems and our main goal in this paper is to achieve a reasonable description of basic multiplicities in systems of varying sizes.</p>}},
  author       = {{Lundberg, Torbjörn and Lönnblad, Leif}},
  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{10}},
  publisher    = {{Springer Nature}},
  series       = {{European Physical Journal C}},
  title        = {{A spacetime model for the perturbative swing}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-025-14864-w}},
  doi          = {{10.1140/epjc/s10052-025-14864-w}},
  volume       = {{85}},
  year         = {{2025}},
}