【摘要】 在³P₀模型框架下,计算A_c（2880）⁺作为2D波激发态的衰变宽度和分支比,确定其量子态并探究内部激发模式.计算结果表明:A_c（2880）⁺有可能是2D激发态A_c2（3/2⁺）,J^P=3/2⁺,且n_ρ=1、l_λ=2,为径向ρ激发、轨道λ激发的激发模式,总衰变宽度Γ_total=18.53 MeV,分支比比值R=Γ（Λ_c（2880）⁺→Σ_c（2520）π）/Γ（Λ_c（2880）⁺→Σ_c（2455）π）=0.16;也可能是2D激发态A’_c2（3/2⁺）,J^P=3/2⁺,且n_λ=1、l_λ=2,为径向λ激发、轨道λ激发的激发模式,总衰变宽度Γ_total=1.69 MeV,分支比比值R=Γ（Λ_c（2880）⁺→E_c（2520）π）/Γ（A_c（2880）⁺→E_c（2455）π）=0.10.更多还原

【Abstract】 The strong decay of Λ_c（2880）+ in the ³P₀ model was investigated.The decay widths and the ratio of branching fractions of Λ^c（2880）⁺ were calculated.The numerical results showed that Λ_c（2880）+ may be a 2D-excited Λ_c2（3/2⁺） with J^P=3/2⁺ n_ρ=1 and l_λ=2 belonged to the radial p-mode excitation and the orbital λ-mode excitation,respectively.The ratio of branching fractions was R=Γ（Λ_c（2880）+→E_c（2520）π）/Γ（Λ_c（2880）+→E_c（2455）π）=0.16.The total decay width was Γ_total=18.53 MeV.Λ_c（2880）+ could also be a 2D-excited Λ’_c2(3/2⁺ with J^P=3/2⁺,n_λ=1 and l_λ=2,indicating the radial λ-mode excitation and the orbital λ-mode excitation.In this study,Γ_total=1.69 MeV,and R=Γ（Λ_c（2880）+→∑_c（2520）π）/Γ（Λ_c（2880）⁺→Σ_c（2455）π）=0.10.更多还原