A_(c)(2880)^(+)2D波激发态的强衰变  

Strong decay ofΛ_(c)(2880)^(+)as 2D-wave excitations

作　　者：李阳 张爱林 LI Yang;ZHANG Ailin(College of Sciences,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学理学院,上海200444

出　　处：《上海大学学报（自然科学版）》2022年第2期347-356,共10页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11975146)。

摘　　要：在^(3)P_(0)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)^(+)→Σ_(c)(2520)π)/Γ(A_(c)(2880)^(+)→Σ_(c)(2455)π)=0.10.The strong decay ofΛ_(c)(2880)^(+)in the^(3)P_(0)model was investigated.The decay widths and the ratio of branching fractions ofΛ_(c)(2880)^(+)were calculated.The numerical results showed thatΛ_(c)(2880)^(+)may be a 2D-excitedΛ_(c2)(3/2^(+))with J^(P)=3/2^(+)n_(ρ)=1 and l_(λ)=2 belonged to the radial p-mode excitation and the orbitalλ-mode excitation,respectively.The ratio of branching fractions was R=Γ(Λ_(c)(2880)^(+)→∑_(c)(2520)π)/Γ(Λ_(c)(2880)^(+)→∑_(c)(2455)π)=0.16.The total decay width wasΓ_(total)=18.53 MeV.Λ_(c)(2880)^(+)could also be a 2D-excitedΛ’_(c2)(3/2^(+))with J^(P)=3/2^(+),n_(λ)=1 and l_(λ)=2,indicating the radialλ-mode excitation and the orbitalλ-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.

关 键 词：^(3)P_(0)模型 强衰变 衰变宽度 分支比比值 

分 类 号：O413[理学—理论物理]