2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41575An explicit model realizing parton-hadron duality and fitting the data is suggested. Complex nonlinear Regge trajectories are important ingredients of the model. The inclusion of $Δ$ and $N^*$ trajectories should account for all resonances in the direct channel. The exotic trajectory is responsible for the smooth background.29 pages, 7 figuresHigh Energy Physics - Phenomenologytext