Interpretation of the newly observed Ωc0 resonances
AbstractWe study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in S wave and thus their total spin is 1. We calculate the mass spectra of the S- and P-wave orbitally excited states and find the Ωc0(2695) and Ωc0(2770) fit well as the S-wave states of charmed doubly strange baryons. The five newly Ωc0(X) resonances observed by the LHCb Collaboration, i.e., Ωc0(3000), Ωc0(3050), Ωc0(3066), Ωc0(3090), and Ωc0(3119), can be interpreted as the P-wave orbitally excited states. In heavy quark effective theory, we analyze their decays into the Ξc+K- and Ξc′+K-, and point out that decays of the five P-wave Ωc0 states into the Ξc+K- and Ξc′+K- are suppressed by either heavy quark symmetry or phase space. The narrowness of the five newly observed Ωc0(X) states can then be naturally interpreted with heavy quark symmetry.