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Helicity amplitudes and electromagnetic decays of hyperon resonances

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Abstract.

We present results for the helicity amplitudes of the lowest-lying hyperon resonances Y*, computed within the framework of the Bonn Constituent-Quark model, which is based on the Bethe-Salpeter approach. The seven parameters entering the model were fitted to the best-known baryon masses. Accordingly, the results for the helicity amplitudes are genuine predictions. Some hyperon resonances are seen to couple more strongly to a virtual photon with finite Q2 than to a real photon. Other Y*'s, such as the S 01(1670) Λ-resonance or the S 11(1620) Σ-resonance, couple very strongly to real photons. We present a qualitative argument for predicting the behaviour of the helicity asymmetries of baryon resonances at high Q2.-1

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Authors and Affiliations

  1. Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000, Gent, Belgium

    T. Van Cauteren & J. Ryckebusch

  2. Helmholtz Institut für Strahlen- und Kernphysik, Nußallee 14-16, D-53115, Bonn, Germany

    B. Metsch & H. -R. Petry

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  1. T. Van Cauteren
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  2. J. Ryckebusch
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  3. B. Metsch
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  4. H. -R. Petry
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Correspondence to T. Van Cauteren.

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Van Cauteren, T., Ryckebusch, J., Metsch, B. et al. Helicity amplitudes and electromagnetic decays of hyperon resonances. Eur. Phys. J. A 26, 339–359 (2005). https://doi.org/10.1140/epja/i2005-10190-3

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  • DOI: https://doi.org/10.1140/epja/i2005-10190-3

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