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Monte Carlo results on the Collins asymmetries in e+e− annihilation

Kerbizi, A. LU ; Lönnblad, L. LU orcid and Martin, A. (2024) 7th International Workshop on Transverse Phenomena in Hard Processes and the Transverse Structure of the Proton, Transversity 2024 477.
Abstract

The quark spin effects have been introduced in the Pythia 8 Monte Carlo event generator for the simulation of e+e− annihilation by interfacing the generator with the StringSpinner package. The package allows to simulate quark spin effects in the string fragmentation routine of Pythia by using the string+3P0 model, recently applied to the fragmentation of a string stretched between a quark-antiquark pair with correlated spin states. StringSpinner is used to carry out simulations of e+e− annihilation at the center of mass energy of 10.6 GeV. The Collins asymmetries are extracted from the simulated data for back-to-back pion pairs using both the thrust axis method and the... (More)

The quark spin effects have been introduced in the Pythia 8 Monte Carlo event generator for the simulation of e+e− annihilation by interfacing the generator with the StringSpinner package. The package allows to simulate quark spin effects in the string fragmentation routine of Pythia by using the string+3P0 model, recently applied to the fragmentation of a string stretched between a quark-antiquark pair with correlated spin states. StringSpinner is used to carry out simulations of e+e− annihilation at the center of mass energy of 10.6 GeV. The Collins asymmetries are extracted from the simulated data for back-to-back pion pairs using both the thrust axis method and the hadronic plane method. The results are compared with the data from the BELLE and BABAR experiments, finding a satisfactory agreement.

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author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Proceedings of Science
volume
477
article number
007
conference name
7th International Workshop on Transverse Phenomena in Hard Processes and the Transverse Structure of the Proton, Transversity 2024
conference location
Trieste, Italy
conference dates
2024-06-03 - 2024-06-07
external identifiers
  • scopus:105037975243
DOI
10.22323/1.477.0007
language
English
LU publication?
yes
id
d8f49aa1-6c68-4e5c-88c4-35204cbd160a
date added to LUP
2026-08-17 14:04:28
date last changed
2026-08-17 14:05:24
@inproceedings{d8f49aa1-6c68-4e5c-88c4-35204cbd160a,
  abstract     = {{<p>The quark spin effects have been introduced in the Pythia 8 Monte Carlo event generator for the simulation of e<sup>+</sup>e<sup>−</sup> annihilation by interfacing the generator with the StringSpinner package. The package allows to simulate quark spin effects in the string fragmentation routine of Pythia by using the string+<sup>3</sup>P<sub>0</sub> model, recently applied to the fragmentation of a string stretched between a quark-antiquark pair with correlated spin states. StringSpinner is used to carry out simulations of e<sup>+</sup>e<sup>−</sup> annihilation at the center of mass energy of 10.6 GeV. The Collins asymmetries are extracted from the simulated data for back-to-back pion pairs using both the thrust axis method and the hadronic plane method. The results are compared with the data from the BELLE and BABAR experiments, finding a satisfactory agreement.</p>}},
  author       = {{Kerbizi, A. and Lönnblad, L. and Martin, A.}},
  booktitle    = {{Proceedings of Science}},
  language     = {{eng}},
  title        = {{Monte Carlo results on the Collins asymmetries in e<sup>+</sup>e<sup>−</sup> annihilation}},
  url          = {{http://dx.doi.org/10.22323/1.477.0007}},
  doi          = {{10.22323/1.477.0007}},
  volume       = {{477}},
  year         = {{2024}},
}