Structure of the Ξb (6227)- resonance
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KünyeAliev, T. M., Azizi, K., Saraç, Y., Sundu, H. (2018). Structure of the Ξb (6227)- resonance. Physical Review D, 98(9), 1-16. http://dx.doi.org/10.1103/PhysRevD.98.094014
We explore the recently observed Ξbð6227Þ− resonance to fix its quantum numbers. To this end, we consider various possible scenarios: It can be considered as either a 1P or 2S excitation of the Ξ−b and Ξ0bð5935Þ ground-state baryons with spin-1 2 or the 1P or 2S excitation of the ground-state Ξbð5955Þ with spin-32. 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 determine the quantum numbers of the state under question. Therefore, we extend the analysis to investigate the possible decays of the excited states into Λ0 bK− and Ξ−b π. 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 Ξbð6227Þ− is a 1P angular-orbital excited state of the Ξbð5955Þ baryon with quantum numbers JP ¼ 32.