Abstract
The Regge-eikonal model in φ 3 field theory is studied within the framework of Gribov's reggeon calculus. A condition is derived that indicates what sort of multireggeon exchange diagrams are important for large energies, and it is shown that the eikonal form is valid only in the weak-coupling limit, i.e., when the inner coupling constant of the reggeons goes to zero: g 2 ∼ 1/ln s. The breakdown of the eikonal approximation outside of this limit is shown to be an effect of inelastic intermediate states.
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