Representations of Reggeon Green's functions: Their scaling form and the approach to scaling

We derive representations for Green's functions in the Reggeon calculus. Our renormalization-group integration method gives the $t$ dependence of the asymptotic scaling functions, as well as the correction terms which are present at nonasymptotic energies. The approach to the scaling form is governed by a critical exponent. The method can be used to calculate the scaling form and the approach to scaling of any $n-\mathrm{to}-m$ Reggeon Green's function. We discuss mainly the Pomeron propagator and the three-point function in the one-loop approximation.