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Description of initial-and final-state-interaction effects for the reaction γp → πΔ++ in the region of nucleon-resonance excitation

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Abstract

A model has been developed for describing the cross section for the reaction γr,v p → πΔ++ in the energy region of nucleon-resonance excitation, and relevant calculations have been performed. The model takes into account the contribution of all reliably established resonances with masses less than 2 GeV and the contributions of nonresonance mechanisms in the approximation of Born diagrams. On the basis of data on the amplitudes of pion-nucleon interactions, a method has been evolved for phenomenologically describing the coupling of initial and final states with open inelastic channels. Calculations performed in this study represent a first step in developing a method for determining the electromagnetic form factors for nucleon resonances in exclusive reactions of pion-pair production on a nucleon by real and virtual photons.

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Translated from Yadernaya Fizika, Vol. 63, No. 1, 2000, pp. 87–92.

Original Russian Text Copyright © 2000 by Anghinolfi, Battaglieri, Golovach, Ishkhanov, Mokeev, Osipenko, Ricco, Ripani, Sapunenko, Taiuti, Fedotov.

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Anghinolfi, M., Battaglieri, M., Golovach, E.N. et al. Description of initial-and final-state-interaction effects for the reaction γp → πΔ++ in the region of nucleon-resonance excitation. Phys. Atom. Nuclei 63, 76–81 (2000). https://doi.org/10.1134/1.855608

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  • DOI: https://doi.org/10.1134/1.855608

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