Simulation of the Polarized Quark Fragmentation with Vector Meson Production

TL;DR

This paper presents a Monte Carlo simulation based on a quantum mechanical model to study polarized quark fragmentation, focusing on vector meson production and spin-dependent effects like transverse spin asymmetries.

Contribution

It introduces a stand-alone Monte Carlo implementation of a quantum mechanical string+${}^3P_0$ model for polarized quark fragmentation including vector mesons, enabling detailed spin effect studies.

Findings

Simulation reproduces experimental data on SIDIS and $e^+e^-$ processes.

Analyzes the impact of vector meson decay on spin asymmetries.

Explores the Collins effect for vector mesons.

Abstract

The recently developed quantum mechanical string+${}^3P_0$ model of polarized quark fragmentation with pseudoscalar and vector meson production has been implemented in a stand alone Monte Carlo program. The simulation enables the detailed study of the quark spin dependent effects in the fragmentation process such as the transverse spin asymmetries. In particular, it allows to investigate the effects of the production and decay of vector mesons on the Collins and dihadron asymmetries of the observed hadrons, and to study the still unknown Collins effect for vector mesons. The main results of the Monte Carlo simulations obtained so far are summarized and the comparison with the existing experimental data on SIDIS and $e^+e^-$ annihilation to hadrons processes are presented.