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Hadrons and Nuclei
Eur. Phys. J. A 7, 573-581

The Q2 dependence of polarized and unpolarized proton structure functions in the relativistic quark exchange framework

M.M. Yazdanpanah2 - M. Modarres1,3

1 Physics Department, Tehran University, Tehran Iran
2 Physics Department, Shahid-Ba-Honar University, Kerman, Iran
3 Institute for Studies in Theoretical Physics and Mathematics, Tehran, Iran

Received: 11 September 1999 / Revised version: 8 December 1999 Communicated by W. Weise

Abstract
In this article we intend to discuss the evolution of polarized and unpolarized structure functions in the (x,Q2) plane. We analyze the proton data on the spin dependence asymmetry A1(x,Q2), by making the dynamical assumption that at low resolution energies, the hadrons consist only of valence quarks and the scaling violation of F2(x,Q2) at low x comes only from the gluons density. While the sea quark and the gluon distributions are calculated using the inverse Mellin technique and the various moments of the valence quarks, the valence quark distribution itself is obtained from the relativistic quark-exchange model. A comparison is made with the corresponding available experimental data. Finally in agreement with the data, it is demonstrated that there is no significant Q2-dependence of asymmetry A1(x, Q2) for x ranging $0.014\le x \le 0.25$.


Copyright Società Italiana di Fisica, Springer-Verlag 2000