Study of multiparticle production in Reggeon field theory

The concept of Reggeon field theory (RFT) is applied to particle production in the multi-Regge region. For processes with repeated Pomeron (P) exchange we calculate the high-energy behavior of the production cross sections n(s) and find that n(s)el(s)(lns)-56 for every n. It is then shown that s-channel unitarity constraints are respected: in the absence of P cuts these processes are known to violate the Froissart bound (Finkelstein-Kajantie problem). We show that the inclusion of P cuts in our RFT model solves this problem, provided the P-particle-P vertex is not large. Furthermore, we demonstrate that the way in which s-channel unitarity is restored does not lead to decoupling problems. Finally, particle production with a secondary Reggeon exchange is considered. We find that the n(s) have qualitatively the same behavior as in the absence of P cuts.