Dynamical model for the gluon distribution function

In this paper, the forms of the gluon distribution function at different Q2 are discussed with the aid of the three quark model and the dynamical calculations of QCD (the leading logarithm approximation). The Buras-Gaemers parametrization is improved and the gluon distribution function obtained can be parametrized by the simple parameter form xG(x,Q2) = xG1(x,Q2) +xG2(x,Q2) = [1+B(s)]2 (1-x)/sup /(s)] +[1+D(s)] (1-x)/sup D/(s). The form satisfies the QCD evolution equation and does not contradict evidently the existing experimental data. The properties of the gluon content in a nucleon are analyzed on this basis. The result indicates that the gluon distribution function can be considered as consisting of two different parts: a soft component and a hard component