$J^P$ Assignments of ${\Lambda }_c^{+}$ Baryons

Abstract

The "good" diquark is employed to study ${\Lambda }_c^{+}$ baryons within a mass loaded flux tube model. The study indicates that all ${\Lambda }_c^{+}$ baryons candidates in the 2008 review by the Particle Data Group (PDG) are well described in the mass loaded flux tube model. The quantum numbers $J^P$ of these ${\Lambda }_c^{+}$ candidates are assigned. If ${\Lambda }_c(2765{)}^{+}$ is an orbitally excited ${\Lambda }_c^{+}$, it is likely the $J^P={\frac{3}{2}}^{+}$ one. If ${\Lambda }_c(2765{)}^{+}$ is an orbitally excited ${\Sigma }_c$, there ought to be another $J^P={\frac{3}{2}}^{+}$ ${\Lambda }_c^{+}$ with mass $\approx 2770$ MeV. In the model, there exists no $J^P={\frac{1}{2}}^{+}$ ${\Lambda }_c(\approx 2700{)}^{+}$ predicted in existing literature. ${\Lambda }_c(2940{)}^{+}$ is very possible the orbitally excited baryon with $J^P={\frac{5}{2}}^{-}$.

Comments: 4 pages, 3 tables, RevTex, Two typos corrected