Eikonal approximation for high-energy inclusive processes

An attempt is made to apply the eikonal approximation to the study of inclusive reactions in the quantum field theory model $\mathscr L_{\scriptsize{ int}}=-ig\psi^*\partial_{\mu}^{\!\!\!\!^{^\leftrightarrow}}\psi A^{\mu}$. The inclusive crossection in the model considered turns out to be dependent on ${\mathbf q}_{\perp}^2$ only, in the fragmentation as well as in the pionisation region.