Parton models and frame independence of high-energy cross-sections

Abstract

We describe some ambiguities which take place when on calculates the cross-sections in parton models at high energies and the connected limitations on the asymptotic of high energy amplitudes that follows from the conditions of boost-invariance of cross-sections. It turns out that the resulting constraints are of the same type as the following from the t-channel unitarity conditions.~ So that on can suppose that this similarity, by their nature, has much more general grounds.