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Helicity amplitudes and electromagnetic decays of hyperon resonances

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arxiv nucl-th/0509047 v1 pith:FYTIR3Q4 submitted 2005-09-19 nucl-th hep-ph

Tim Van Cauteren (1) , Jan Ryckebusch (1) , Bernard Metsch (2) , Herbert-R. Petry (2) ((1) Ghent University , Belgium , (2) Helmholtz Institut fuer Strahlen- und Kernphysik , Bonn , Germany) This is my paper · ORCID
classification nucl-thhep-ph
keywords helicityresonancesamplitudeshyperonbaryoncouplemodelphoton
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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 Q^2 than to a real photon. Other Y*'s, such as the S_{01}(1670) Lambda resonance or the S_{11}(1620) Sigma 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 Q^2.

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  1. Radiative decays of the $\Lambda(1520)$ as a dynamically generated resonance

    hep-ph 2026-05 unverdicted novelty 6.0 of 10

    In the chiral unitary approach with dimensional regularization and new photon-baryon diagrams, the computed Lambda(1520) to gamma Sigma0 width matches BESIII data while the gamma Lambda width underpredicts the CLAS result.

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