The quark spin effects have been introduced in the Pythia 8 Monte Carlo event generator for the simulation of e+e− annihilation by interfacing the generator with the StringSpinner package. The package allows to simulate quark spin effects in the string fragmentation routine of Pythia by using the string+3P0 model, recently applied to the fragmentation of a string stretched between a quark-antiquark pair with correlated spin states. StringSpinner is used to carry out simulations of e+e− annihilation at the center of mass energy of 10.6 GeV. The Collins asymmetries are extracted from the simulated data for back-to-back pion pairs using both the thrust axis method and the hadronic plane method. The results are compared with the data from the BELLE and BABAR experiments, finding a satisfactory agreement.
}}, author = {{Kerbizi, A. and Lönnblad, L. and Martin, A.}}, booktitle = {{Proceedings of Science}}, language = {{eng}}, title = {{Monte Carlo results on the Collins asymmetries in e+e− annihilation}}, url = {{http://dx.doi.org/10.22323/1.477.0007}}, doi = {{10.22323/1.477.0007}}, volume = {{477}}, year = {{2024}}, }