Helicity amplitudes and electromagnetic decays of hyperon resonances
Van Cauteren, Tim · Ryckebusch, Jan · Metsch, Bernard · Petry, Herbert-R.
Original · EN
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 S₀₁(1670) Lambda resonance or the S₁₁(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 Q².
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