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
.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
