Y.B. Dong

Study of quark-hadron duality based on a constituent quark model

The nucleon structure functions F-2 and g(1) in the resonance region are estimated by employing a simple constituent quark model. The scaling behaviors of the nucleon structure functions in the deep inelastic scattering region are used to compare with our calculated results generated by the low-lying nucleon resonances in the resonance region. Quark-hadron duality in the nucleon-electron scattering process is discussed

Hypercentral Constituent Quark Model with a Meson Cloud

The results for the elastic nucleon form factors and the electromagnetic transition amplitudes to the Δ ( 1232 ) resonance, obtained with the Hypercentral Constituent Quark Model with the inclusion of a meson cloud correction are briefly presented. The pion cloud effects are explicitly discussed.

Negative parity N* resonances in an extended GBE

In this paper, we calculate the masses and mixing angles of L = 1 negative parity N* resonances in an extended GBE (Goldstone-boson-exchange model) with harmonic-oscillator wave functions. By using those mixing angles, we get their photo-production amplitudes, and compare them with experimental data and the results of OPE (one-pion-exchange model), OPsE (only pseudoscalar meson exchange model), and OGE (one-gluon-exchange model). We find that the extended GBE gives right internal wave functions. It is essential to extend GBE to include not only pseudoscalar meson exchanges but also vector meson exchanges

Nucleon form factors in a light-cone quark model with two-photon exchange

We estimate the two-photon exchange corrections to both proton and neutron electromagnetic physical observables in a relativistic light cone quark model At a fixed Q(2) the corrections are found to be small in magnitudes. but strongly dependent oil scattering angle Our results are comparable to those obtained from simple hadronic model in the medium momentum transfer region (C) 2009 Elsevier B V All rights reserved

Nucleon spin structure functions in the resonance region with constituent quark models

Abstract Q 2 -evolution of the nucleon spin structure functions g 1 , g 2 and the generalized Gerasimov–Drell–Hearn sum rule in the small- Q 2 region are investigated by considering the resonance contributions based on nonrelativistic constituent quark model and on relativistic four-dimensional harmonic oscillator model, respectively. Results of the two models are compared and the relativistic effects are discussed. Moreover, influences of the longitudinal transitions of the resonances on the sum rules of the nucleon spin structure functions are addressed.