Monte Carlo results on the Collins asymmetries in $e^+e^-$ annihilation
Abstract
The quark spin effects have been introduced in the Pythia 8 Monte Carlo event generator for the simulation of 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+ 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 annihilation at the center of mass energy of . 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.
Cite
@article{arxiv.2410.11489,
title = {Monte Carlo results on the Collins asymmetries in $e^+e^-$ annihilation},
author = {A. Kerbizi and L. Lönnblad and A. Martin},
journal= {arXiv preprint arXiv:2410.11489},
year = {2024}
}
Comments
8 pages, 4 figures, Proceedings of 7th International Workshop on Transverse phenomena in hard processes and the transverse structure of the proton (Transversity2024). arXiv admin note: substantial text overlap with arXiv:2312.17034