Abstract
Inspired by the newly observed Omega _b states by the LHCb Collaboration, we investigate the two-body strong decays of the low-lying lambda -mode Omega _b baryons up to 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)^- and Omega _b(6330)^- are good candidates of the light spin j=1 states, while the spin-parity J^P=1/2^- and J^P=3/2^- cannot be distinguished. The other two states, Omega _b(6340) and Omega _b(6350) mostly correspond to the light spin j=2 states, while the spin-parity J^P=3/2^- and J^P=5/2^- cannot be distinguished as well. (ii) The 2S states with spin-parity J^P=1/2^+ and J^P=3/2^+, respectively, might be narrow states with a width of Gamma <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.
Highlights
Since the heavy quark provides a “flavour tag” that may give insight into the systematics of hadron resonances and the mechanism of confinement, the studies of hadrons containing heavy quarks (c or b) are important topics in hadron physics.It is evident that heavy-quark hadrons play an important role in our understanding of QCD
Inspired by the newly observed four peaks by the LHCb Collaboration [10], we carry out a systematic study of the strong decay behaviors of the singly bottom baryons b up to N = 2 shell within the j- j coupling scheme in the framework of the chiral quark model
In Ref. [34] we have studied the strong decays of the 1D-wave b states in the L-S
Summary
Since the heavy quark provides a “flavour tag” that may give insight into the systematics of hadron resonances and the mechanism of confinement, the studies of hadrons containing heavy quarks (c or b) are important topics in hadron physics.It is evident that heavy-quark hadrons play an important role in our understanding of QCD. |2 P1/2 and |4 P1/2 are most likely to be broad states with a width of ∼ (50–100) MeV [24]; in the j- j coupling scheme only the j = 0 P-wave state with J P = 1/2−
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