VECTOR AND AXIAL-VECTOR STRUCTURES OF THE Θ⁺

Abstract

We present in this talk recent results of the vector and axial-vector transitions of the nucleon to the pentaquark baryon Θ + , based on the SU (3) chiral quark-soliton model. The results are summarized as follows: K * N Θ vector and tensor coupling constants turn out to be g K * N Θ ≃ 0.81 and f K * N Θ ≃ 0.84, respectively, and the KN Θ axial-vector coupling constant to be g * A ≃ 0.05. As a result, the total decay width for Θ + → N K becomes very small: Γ Θ→N K ≃ 0.71 MeV, which is consistent with the DIANA result Γ Θ→N K = 0.36 ± 0.11 MeV.