Strong and radiative decays of DΞmolecular state and newly observed $Ω_c$ states

Abstract

In this work, we study strong and radiative decays of S-wave DΞmolecular state, which is related to the Ω^*_c states newly observed at LHCb. The coupling between the DΞmolecular state and its constituents D and Ξis calculated by using the compositeness condition. With the obtained coupling, the partial decay widths of the DΞmolecular state into the Ξ_c^{+}K^{-}, Ξ^{'+}_cK^{-} and Ω^{*}_c(2695)γfinal states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the Ω^{*}_c(3119) or Ω^{*}_c(3050) as DΞmolecule while the the decay width of the Ω^{*}_c(3000), Ω^{*}_c(3066) and Ω^{*}_c(3090) can not be well reproduced in the molecular state picture. The partial decay widths are also presented and helpful to further understand the internal structures of Ω^{*}_c(3119) and Ω^{*}_c(3050).

7pages,6 figures