Inclusion of the ${}^3{P}_0$ model in PYTHIA 8

Abstract

The spin effects in the hadronization process have been included for the first time in the PYTHIA 8 event generator. The spin effects are limited to the production of pseudo-scalar mesons and are obtained from the propagation of the quark polarization along the fragmentation chain according to the rules of the so-called ${}^3{P}_0$ model. The interface between PYTHIA 8 and the package of the ${}^3{P}_0$ model is presented together with preliminary results on the Collins and di-hadron asymmetries as obtained from simulations of the transversely polarized semi-inclusive deep inelastic scattering process.

Comments: 6 pages, 3 figures, to be published in proceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects