Reggeon field theory at D = 2. Part 1 One-loop approximation

A general method of constructing an explicit representation is developed for the pomeron propagator in the presence of additional parameters, such as the pomeron production threshold xi0, momentum transfer K vector or the intercept shift delta0. The method is shown to be applicable in both one-loop and two-loop approximations. The obtained general formulae allow to consider the pomeron propagator in both asymptotic region and the region of the perturbation theory applicability, and, besides, they provide the smooth matching of both these regions. The observed values are calculated, and the results connected with asymptotically high energies are being discussed