References
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The contribution is increased by the factor π/2 with respect to the resonance saturation result (15), as it occurs in the π-π Veneziano amplitude, see,e.g.,C. A. Savoy:Lett. Nuovo Cimento,1, 263 (1969); eq. (18) contains a misprint, the r.h.s. should be multiplied by 2.
S. Weinberg:Phys. Rev. Lett.,17, 616 (1966).
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Costa, G., Savoy, C.A. & Villani, A. Parity constraints and factorization in the veneziano model. Lettere Nuovo Cimento (1969-1970) 2, 137–142 (1969). https://doi.org/10.1007/BF02754524
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DOI: https://doi.org/10.1007/BF02754524