StringSpinner -- adding spin to the PYTHIA string fragmentation

Abstract

StringSpinner is a plugin for the introduction of the spin effects in the hadronization part of the PYTHIA 8 event generator. The spin effects are generated for pseudoscalar meson production by propagating the quark polarization along the fragmentation chain according to the rules of the quantum mechanical string+${}^3{P}_0$ model. By using parametrizations for the transversity parton distribution functions, StringSpinner allows to simulate the polarized semi inclusive deep inelastic scattering process on protons and neutrons. The instructions to use StringSpinner and to modify the parametrizations of the transversity distribution functions are presented, as well as an example of the calculation of the Collins asymmetries as obtained from simulations of the transversely polarized semi inclusive deep inelastic scattering process.

arXiv comment16 pages, 1 figure, submitted to Computer Physics Communications

References in corpus (15)

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Cited by in corpus (3)

• Event Generators for High-Energy Physics Experiments
• The String+${}^3{P}_0$ Model of Hadronization
• Simulation of the Polarized Quark Fragmentation with Vector Meson Production