Recursive model for the fragmentation of polarized quarks

Abstract

We present a model for Monte Carlo simulation of the fragmentation of a polarized quark. The model is based on string dynamics and the ${}^3{P}_0$ mechanism of quark pair creation at string breaking. The fragmentation is treated as a recursive process, where the splitting function of the subprocess $q\to h+q^{\prime }$ depends on the spin density matrix of the quark $q$. The ${}^3{P}_0$ mechanism is parametrized by a complex mass parameter $\mu$, the imaginary part of which is responsible for single spin asymmetries. The model has been implemented in a Monte Carlo program to simulate jets made of pseudoscalar mesons. Results for single hadron and hadron pair transverse-spin asymmetries are found to be in agreement with experimental data from SIDIS and $e^{+}{e}^{-}$ annihilation. The model predictions on the jet-handedness are also discussed.

arXiv comment18 pages, 18 figures

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Cited by in corpus (10)

• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• StringSpinner -- adding spin to the PYTHIA string fragmentation
• Production of vector mesons in the String+${}^3{P}_0$ model of polarized quark fragmentation
• A simplified recursive ${}^3{P}_0$ model for the fragmentation of polarized quarks
• Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
• Transversity distributions from difference asymmetries in semi-inclusive DIS
• Measurement of the azimuthal modulations of hadrons in unpolarised SIDIS
• Graphical Structure of Hadronization and Factorization in Hard Collisions
• The String+${}^3{P}_0$ Model of Hadronization
• Simulation of the Polarized Quark Fragmentation with Vector Meson Production