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Quark spin effects in e+e- annihilation : A Monte Carlo event generator study

Kerbizi, A. ; Lönnblad, L. LU orcid and Martin, A. (2024) In Physical Review D 110(7).
Abstract

Quark spin effects in e+e- annihilation to pseudoscalar and vector mesons are implemented for the first time in the pythia Monte Carlo event generator. The spin-dependent fragmentation of the string stretched between the produced quark-antiquark pair with correlated spin states is described by the string+P30 model implemented in the string fragmentation routine of pythia by using the StringSpinner package. The simulated events are used to study the model predictions for the Collins asymmetries of mesons produced back-to-back in the e+e- center of mass system by using both the thrust axis method and the hadronic plane method. The obtained asymmetries are compared to the available data from the BELLE and BABAR experiments and the... (More)

Quark spin effects in e+e- annihilation to pseudoscalar and vector mesons are implemented for the first time in the pythia Monte Carlo event generator. The spin-dependent fragmentation of the string stretched between the produced quark-antiquark pair with correlated spin states is described by the string+P30 model implemented in the string fragmentation routine of pythia by using the StringSpinner package. The simulated events are used to study the model predictions for the Collins asymmetries of mesons produced back-to-back in the e+e- center of mass system by using both the thrust axis method and the hadronic plane method. The obtained asymmetries are compared to the available data from the BELLE and BABAR experiments and the underlying Collins analyzing power from the string+P30 model is compared with phenomenological extractions.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D
volume
110
issue
7
article number
074029
publisher
American Physical Society
external identifiers
  • scopus:85208652911
ISSN
2470-0010
DOI
10.1103/PhysRevD.110.074029
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
id
31729921-4586-457c-8de4-ce047e4ea392
date added to LUP
2025-01-22 12:58:11
date last changed
2025-04-04 14:01:23
@article{31729921-4586-457c-8de4-ce047e4ea392,
  abstract     = {{<p>Quark spin effects in e+e- annihilation to pseudoscalar and vector mesons are implemented for the first time in the pythia Monte Carlo event generator. The spin-dependent fragmentation of the string stretched between the produced quark-antiquark pair with correlated spin states is described by the string+P30 model implemented in the string fragmentation routine of pythia by using the StringSpinner package. The simulated events are used to study the model predictions for the Collins asymmetries of mesons produced back-to-back in the e+e- center of mass system by using both the thrust axis method and the hadronic plane method. The obtained asymmetries are compared to the available data from the BELLE and BABAR experiments and the underlying Collins analyzing power from the string+P30 model is compared with phenomenological extractions.</p>}},
  author       = {{Kerbizi, A. and Lönnblad, L. and Martin, A.}},
  issn         = {{2470-0010}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{7}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review D}},
  title        = {{Quark spin effects in e+e- annihilation : A Monte Carlo event generator study}},
  url          = {{http://dx.doi.org/10.1103/PhysRevD.110.074029}},
  doi          = {{10.1103/PhysRevD.110.074029}},
  volume       = {{110}},
  year         = {{2024}},
}