The Regge-pole formalism is applied to the calculation of the differential cross section for A1+ photo-production in the region |tmin| < -t < 10µ2. The p, A1, A1-daughter, A2, and π trajectory contributions are considered, and use is made of chiral dynamics to estimate the unknown coupling constants. We find that the π and the A2 trajectories provide the dominant contributions.
K. Kikkawa and B. N. Hale, "Differential Cross Section for Charged A1 Photoproduction Using the Regge Exchange Formalism," Physical Review D, Particles and fields, vol. 1, no. 3, pp. 903-907, American Physical Society (APS), Feb 1970.
The definitive version is available at https://doi.org/10.1103/PhysRevD.1.903
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