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Leif Lönnblad

Professor

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Simulation of e+e− annihilation with quark spin effects

Author

  • A. Kerbizi
  • L. Lönnblad
  • A. Martin

Summary, in English

The quark spin effects are introduced for the first time in the string fragmentation routine of the Pythia 8 Monte Carlo event generator for the simulation of e+e− annihilation to hadrons. To describe the spin effects the string+3P0 model of polarized hadronization with emissions of pseudoscalar and vector mesons is used. The spin effects are activated in the generator by extending the StringSpinner package, previously applied to the simulation of deep inelastic scattering off a polarized nucleon. The generator is used to carry out simulations of e+e− annihilation at the center of mass energy of 10.6 GeV. The Collins asymmetry for back-to-back pion pairs is evaluated and compared to the asymmetry as measured by the BELLE experiment. A satisfactory agreement is found.

Department/s

  • Particle and nuclear physics

Publishing year

2024-07

Language

English

Publication/Series

Proceedings of Science

Volume

456

Document type

Conference paper

Publisher

Sissa Medialab srl

Topic

  • Subatomic Physics

Conference name

25th International Symposium on Spin Physics, SPIN 2023

Conference date

2023-09-24 - 2023-09-29

Conference place

Durham, United States

Status

Published