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Analysis of the Photoproduction of η-Mesons on Protons in a Resonance Energy Range

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Russian Physics Journal Aims and scope

Abstract

A model of the photoproduction of η-mesons on protons with energies from the reaction threshold to 2.5 GeV takes into account contributions to the amplitude of eleven nucleon resonances: S 11(1535), S 11(1650), P 11(1440), P 13(1720), D 13(1520), D 15(1675), F 15(1680), F 17(1990), G 17(2190), G 19(2250), and H 19(2220) and of the background component comprising the nucleon pole and the exchange by vector mesons in the t-channel. Recent experimental data on cross sections and Σ-asymmetry of the γp→ηp process measured from the reaction threshold to 1.1 GeV are used as a criterion of correctness of the model. Starting from photon energies of 1.7 GeV and higher, the cross section of the process depends strongly on the contribution of the ω-meson, that is, on the mechanism of action of vector mesons on the photoproduction amplitude and constants of vector meson coupling with η-mesons and nucleons. The calculated cross sections and Σ-asymmetry of the γp→ηp process at energies exceeding 1.4 GeV do not contradict the available experimental data.

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Authors and Affiliations

  1. Tomsk Polytechnic University, Russia

    V. A. Tryasuchev

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  1. V. A. Tryasuchev
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Tryasuchev, V.A. Analysis of the Photoproduction of η-Mesons on Protons in a Resonance Energy Range. Russian Physics Journal 46, 403–406 (2003). https://doi.org/10.1023/A:1025732127536

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