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| Paper IPM / Physic / 6729 |
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| Abstract: | |||||
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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 ≤ x ≤ 0.25.
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