Higher-order terms in the triple-Regge region

Using the expansion of Reggeon field theory, we evaluate the exponent which governs the behavior of the inclusive differential cross section in the triple-Regge region at second order. It is found that the first-order result is modified by contributions coming from g4 terms connecting three Pomeron lines, and that only diagrams with one or two Pomeron lines attached to the external particles are important at asymptotic energies. © 1977 The American Physical Society.