Odderon in QCD

Abstract

A review on how the Odderon idea does appear in QCD is given. In the last years it has been developed a non-perturbative QCD approach based on the stochastic vacuum model and a perturbative one based on resummation techniques in the small x QCD region. Last developments on the perturbative analysis are shown in some details, in particular in application to diffractive eta_c production.Comment: 6 pages, 1 eps figure, Talk at the 9th International Workshop on Deep Inelastic Scattering and QCD (DIS2001), Bologna, Italy, Apr. 27 - May 1, 200