Constraints of duality on Regge couplings

The application of duality in the form of finite-mass sum rules (FMSR) makes it possible, under certain conditions, to express the Regge couplings which appear in quasi-two-body reactions in terms of the triple-Regge vertex. The method is applied to rho - π scattering, where rho is a reggeon and π a particle, and, using for the triple-Regge coupling the values obtained in a dual unitary calculation, results in fair agreement with experiment are derived