Coupling of K^^-^*N to the Λ(1520)(Hadrons at finite density)

概要

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We study the coupling of the Λ(1520)≡Λ* resonance to the K* vector meson and nucleon. This coupling is not directly measured from the resonance decay, but is expected to be important in hyperon production reactions. We compute the coupling in two different schemes, one in the chiral unitary model where the Λ* is dominated by the quasibound state of mesons and baryons, and the other in the quark model where the resonance is a p-wave excitation in the three valence quarks. It is found that there is a significant difference between the Λ*K*N couplings in the two models. In the chiral unitary model |gΛ*K*N|〜1.5, while in the quark model |gΛ*K*N|〜2.5. The difference of the results stems from the different structure of the Λ* in both models, and hence, an experimental determination of this coupling would shed light on the nature of the resonance.
素粒子論グループ素粒子研究編集部の論文
2006-11-20