Possible interpretation of the newly observed $$\Omega _b$$ Ωb states

Abstract

Abstract Inspired by the newly observed $$\Omega _b$$ Ωb states by the LHCb Collaboration, we investigate the two-body strong decays of the low-lying $$\lambda $$ λ -mode $$\Omega _b$$ Ωb baryons up to $$N=2$$ N=2 shell using the chiral quark model within the j-j coupling scheme. Our results indicate that: (i) the newly observed states $$\Omega _b(6316)^-$$ Ωb(6316)- and $$\Omega _b(6330)^-$$ Ωb(6330)- are good candidates of the light spin $$j=1$$ j=1 states, while the spin-parity $$J^P=1/2^-$$ JP=1/2- and $$J^P=3/2^-$$ JP=3/2- cannot be distinguished. The other two states, $$\Omega _b(6340)$$ Ωb(6340) and $$\Omega _b(6350)$$ Ωb(6350) mostly correspond to the light spin $$j=2$$ j=2 states, while the spin-parity $$J^P=3/2^-$$ JP=3/2- and $$J^P=5/2^-$$ JP=5/2- cannot be distinguished as well. (ii) The 2S states with spin-parity $$J^P=1/2^+$$ JP=1/2+ and $$J^P=3/2^+$$ JP=3/2+ , respectively, might be narrow states with a width of $$\Gamma <2$$ Γ<2 MeV. (iii) The 1D states are not broad and the total decay widths vary from several to dozens of MeV, which have a good potential to be observed in future experiments.