Low-lying charmed and charmed-strange baryon states

Abstract

In this work, we systematically study the mass spectra and strong decays of 1P and 2S charmed and charmed-strange baryons in the framework of non-relativistic constituent quark models. With the light quark cluster–heavy quark picture, the masses are simply calculated by a potential model. The strong decays are studied by the Eichten–Hill–Quigg decay formula. Masses and decay properties of the well-established 1S and 1P states can be reproduced by our method. Σ c(2800) 0,+,+ + can be assigned as a Σ c2(3 / 2 -) or Σ c2(5 / 2 -) state. We prefer to interpret the signal Σ c(2850) 0 as a 2 S(1 / 2 +) state although at present we cannot thoroughly exclude the possibility that this is the same state as Σ c(2800) 0. Λ c(2765) + or Σ c(2765) + could be explained as the Λc+(2S) state or Σc1+(1/2-) state, respectively. We propose to measure the branching ratio of B(Σ c(2455) π) / B(Σ c(2520) π) in the future, which may disentangle the puzzle of this state. Our results support Ξ c(2980) 0 ,+ as the first radial excited state of Ξ c(2470) 0 , + with JP= 1 / 2 +. The assignment of Ξ c(2930) 0 is analogous to Σ c(2800) 0 , + , + +, i.e., a Ξc2′(3/2-) or Ξc2′(5/2-) state. In addition, we predict some typical ratios among partial decay widths, which are valuable for experimental search for these missing charmed and charmed-strange baryons.