Speaker
Dr
Er-Liang Cui
(Northwest A&F University)
Description
In this talk, I would like to report our recent studies on spectra and decay properties of the excited bottom baryons, $\Sigma_b(6097)$, $\Xi_b(6227)$ and four narrow $\Omega_b$ states, which were newly discovered by LHCb collaboration. At first, we calculated the spectra of P-wave bottom baryons by using the QCD sum rule. The estimations are well consistent with the experimental results. Then We also utilized the method of light−cone sum rules, which is widely used to study the hadron decays in recent years. Our estimations suggest that the bottom baryons $\Sigma_{b}(6097)^{\pm}$ and $\Xi_{b}(6227)^-$ both belong to the P−wave bottom baryon doublet $[\mathbf{6}{F},2,1,\lambda]$, whose color is symmetric $\mathbf{6}_{F}$, the total angular momentum of light system is 2, the spin of light system is 1, and it is $\lambda$−type excitation. And the four narrow $\Omega_b$ states can also be explained as the P-wave bottom baryons but belong to different excitation types. We also made some other predictions.
Primary author
Dr
Er-Liang Cui
(Northwest A&F University)
