Polarized parton distribution in the relativistic quark exchange framework
M.M. Yazdanpanah1 - M. Modarres2,3
1 Physics Department, Shahid-Bahonar University, Kerman, Iran
2 Physics Department, Tehran University, Tehran, Iran
3 Center for Theoretical Physics and Mathematics AEOI P.O. Box 11365-8486 Tehran, Iran
Received: 4 January 1999 / Revised version: 12 April 1999 Communicated by W. Weise
The Spin dependent gluon and sea quark distributions of the proton and the neutron are extracted in the leading order (LO) and the next-to-leading order (NLO) QCD. The relativistic quark exchange model is used to calculate the related valence quark spin dependent structure function. The inverse Mellin transform technique is performed to evaluate the polarized x-dependent distributions of the gluon and the sea quark from the various moments of the valence quarks. It is shown that the calculated spin structure functions (SSF) of the proton and the neutron are in good agreement with the available data, such as E143, SMC, E142, E154 and Hermes experiments. A comparison is also made with the other theoretical models. Finally it is shown that the above calculated parton distributions improve the SSF of the proton and the neutron.
24.85.+p Quarks, gluons, and QCD in nuclei and nuclear processes - 12.39.Ki Relativistic quark model - 13.60.Hb Total and inclusive cross sections (including deep-inelastic processes) - 21.45.+V Few-body systems