GLUONIC REGGEONS

Contributions from gluon interactions, which are non-leading in high-e nergy semi-hard processes, are studied and represented in terms of reg geon exchanges. Unlike the leading gluonic reggeon, related to the BFK L pomeron, the non-leading reggeons are sensitive to the spin and tran sverse momentum distributions of scattering partons. There are several gluonic reggeons with poles in the vicinity of angular momentum j = 0 contributing to the perturbative Regge asymptotics of QCD. We extend the high-energy effective action including sub-leading terms which des cribe these reggeons and their interactions with scattering quarks and gluons in the multi-Regge approximation. (C) 1998 Elsevier Science B. V.