Abstract
We explore the recently observed $\Xi_b(6227)^{-}$ resonance to fix its quantum numbers. To this end, we consider various possible scenarios: It can be considered as either 1P/2S excitations of the $\Xi_b^-$ and $\Xi_b'(5935)^{-}$ ground state baryons with spin-$\frac{1}{2}$ or 1P/2S excitations of the ground state $\Xi_b(5955)^{-}$ with spin-$\frac{3}{2}$. We calculate the masses of the possible angular-orbital $1P$ and $2S$ excited states corresponding to each channel employing the QCD sum rule technique. It is seen that all the obtained masses are in agreement with the experimentally observed value, implying that the mass calculations are not enough to distinguish the quantum numbers of the state under question. Therefore, we extend the analysis to investigate the possible decays of the same excited states into $\Lambda_b^0 K^-$ and $\Xi_b^-\pi$. Using the light cone QCD sum rule method, we calculate the corresponding strong coupling constants, which are used to extract the decay widths of the modes under consideration. Our results on decay widths indicate that the $\Xi_b(6227)^{-}$ is $1P$ angular-orbital excited state of the $\Xi_b(5955)^{-}$ baryon with quantum numbers $J^P=\frac{3}{2}^{-}$.
Highlights
The theoretical studies of the heavy baryons involving their spectroscopic parameters and the interaction mechanisms improve our understanding on the nonperturbative regime of the strong interaction, as well as their nature and internal structure
We explore the recently observed Ξb(6227)− resonance to fix its quantum numbers
The spectroscopy of the heavy baryons containing b quark has been investigated within different models
Summary
The theoretical studies of the heavy baryons involving their spectroscopic parameters and the interaction mechanisms improve our understanding on the nonperturbative regime of the strong interaction, as well as their nature and internal structure. As a result of the impressive developments in the experimental sector in the last decade, almost all of the ground state baryons with single heavy quark were observed [1–9]. The spectroscopy of the heavy baryons containing b quark has been investigated within different models. The impressive developments in the experimental techniques indicate that more heavy baryons would be observed in near future. With this motivation and the motivation brought by the recent observation of the LHCb Collaboration [35], we investigate the masses and decay collaboration recently constants reported of the low-lying 2S and 1P excited Ξb baryons having the observation of Ξb(6227)− with mass mΞb(6227)− =. The observed state is considered as 1P and
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