Strong and electromagnetic meson-hyperon couplings in the bound-state soliton model

Abstract

The KNΛ and KNΣ as well as the corresponding DNΛ c and DNΣ c coupling constants are calculated in the model in which the strange and charmed hyperons are described as bound states of an SU(2) soliton and heavy flavour mesons. The coupling lagrangians as well as the corresponding threshold photoproduction amplitudes are found to have approximately the same form as expected in the conventional pseudovector coupling model in spite of the chiral symmetry breaking implied by the large meson mass terms. The calculated coupling constants fall within the range of values obtained with alternative approaches and of phenomenological analyses.