Radiative decay and axial-vector decay behaviors of octet pentaquark states

Abstract

In this work, we systematically calculate transition magnetic moments, radiative decay widths, and axial-vector coupling constants of octet hidden-charm molecular pentaquark states with different flavor representations in constituent quark model. We discuss the relations between transition magnetic moments and decay widths for pentaquark states. For octet pentaquark states with the 81f and 82f flavor representations, decay widths of the processes Pψ|32−⟩(12+⊗1−)→Pψ|12−⟩(12+⊗0−)γ and Pψ|12−⟩(12+⊗1−)→Pψ|12−⟩(12+⊗0−)γ are quite close, and decay widths of the Pψ|32−⟩(12+⊗1−)→Pψ|12−⟩(12+⊗1−)γ process are close to zero, and we notice that the axial-vector coupling constants of the pentaquark states are generally smaller than that of the nucleon. Published by the American Physical Society 2024