Strong and radiative decays of the low-lying D -wave singly heavy baryons

Abstract

The strong and radiative decays of the low-lying λ-mode D-wave Λc(b), Σc(b), Ξc(b), Ξc(b)′, and Ωc(b) baryons are studied in a constituent quark model. Our calculation shows the following: (i) The missing λ-mode D-wave Ωc(b), Λb, and Ξb baryons have a relatively narrow decay width of a few MeV or a few tens of MeV and their dominant strong and radiative decay channels can be ideal for searching for their signals in future experiments. (ii) The λ-mode 1D-wave excitations in the Σc(b) and Ξc(b)′ families appear to have a relatively broad width of ∼50-200 MeV. Most of the 1D-wave states have large decay rates into the 1P-wave heavy baryons via the pionic or kaonic strong decay processes, which should be taken seriously in future observations. (iii) Both Λc(2860) and Ξc(3050) seem to favor the JP=3/2+ excitation |D2λλ32+ 3̄F, while both Λc(2880) and Ξc(3080) may be assigned as the JP=5/2+ excitation |D2λλ52+ of 3̄F, The nature of Ξc(3050) and Ξc(3080) could be tested by the radiative transitions Ξc(3055)0→Ξc(2790)0γ and Ξc(3080)0→Ξc(2815)0γ, respectively.