We present a model for Monte Carlo simulation of the fragmentation of a polarized quark. The model is based on string dynamics and the P30 mechanism of quark pair creation at string breaking. The fragmentation is treated as a recursive process, where the splitting function of the subprocess q→h+q′ depends on the spin density matrix of the quark q. The P30 mechanism is parametrized by a complex mass parameter μ, 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.

Recursive model for the fragmentation of polarized quarks

Kerbizi A.
;
Bradamante F.;Martin A.
2018-01-01

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 P30 mechanism of quark pair creation at string breaking. The fragmentation is treated as a recursive process, where the splitting function of the subprocess q→h+q′ depends on the spin density matrix of the quark q. The P30 mechanism is parametrized by a complex mass parameter μ, 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.
3-feb-2018
Pubblicato
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.074010
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2945360
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