Gluon production on two centers and the effective action approach
  Application of the effective action formalism is studied for processes in which the reggeons may split. It is shown that the gluon production on two centers is described by the contribution of the Reggeon-to-two-Reggeons-plus-Particle vertex supplemented by certain singular contributions from the double gluon exchange. The rules for longitudinal integrations are established from the comparison to perturbative QCD amplitude. Convenient expressions for application to the inclusive gluon production are derived. 
M.A. Braun (1), L.N. Lipatov (1 and 2), M.Yu. Salykin (1) and M.I.   Vyazovsky (1) ((1) Saint-Petersburg State University, R...
hep-ph