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Leif Lönnblad

Professor

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Adding quark spin effects to PYTHIA string fragmentation

Author

  • Albi Kerbizi
  • Leif Lönnblad

Summary, in English

Quark spin effects in hadronization have been recently included in the PYTHIA 8 event generator for the simulation of the deep inelastic scattering (DIS) process off a polarized nucleon target via the external StringSpinner package. The spin effects can be simulated for the production of pseudoscalar mesons using the string+3P0 model of polarized quark fragmentation and parametrizations of the transversity PDFs. We present here a major development of StringSpinner which includes the production of vector mesons in the polarized PYTHIA 8 string fragmentation as well as their polarized decays. The package is validated and used to simulate the transverse-spin asymmetries in semi-inclusive DIS (SIDIS). The simulation results on the Collins and dihadron asymmetries for the final state mesons are compared with the asymmetries measured in SIDIS off transversely polarized protons. Also shown are the predictions for the Collins asymmetries for p mesons produced in SIDIS off transversely polarized protons.

Department/s

  • Particle and nuclear physics

Publishing year

2022

Language

English

Publication/Series

Proceedings of Science

Volume

414

Document type

Conference paper

Publisher

Sissa Medialab srl

Topic

  • Subatomic Physics

Conference name

41st International Conference on High Energy Physics, ICHEP 2022

Conference date

2022-07-06 - 2022-07-13

Conference place

Bologna, Italy

Status

Published