Abstract
Within the framework of the narrow-width approximation for resonances and under rather general assumptions fors- andt-channel Regge trajectories (linearitynot included), the Veneziano rormula and the supplementary condition are shown to follow uniquely from the requirement that FESR’s with momentsm=0, 1 and 2 reproduce as many Regge zeros as possible, with continuity from positivet to some negative valuetc depending on the cut-off.
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