Helicity amplitudes and electromagnetic decays of hyperon resonances

(2) Helmholtz Institut fuer Strahlen- und Kernphysik; Belgium; Bernard Metsch (2); Bonn; Germany); Herbert-R. Petry (2) ((1) Ghent University; Jan Ryckebusch (1); Tim Van Cauteren (1)

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

Helicity amplitudes and electromagnetic decays of hyperon resonances

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

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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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