Dual resonance model incorporating two different parent Regge trajectories in the same channel

A four-particle dual model is constructed with two different Regge trajectories in both the s and t channels. The amplitude is crossing-symmetric, has residues that are polynomial of correct order, and has full Regge behavior. In a certain limit it becomes the Euler B function. The multiparticle generalization of the present model will be relevant to construction of hadron models with realistic mass spectra