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| Paper IPM / P / 15343 |
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In the present study we explore the recently observed Ξb(6227)− resonance to fix its quantum numbers. To this end we consider various possible scenarios: it can be considered as either orbital/radial excitations of the Ξb− and Ξb′(5935)− ground state baryons with spin-[1/2] or orbital/radial excitations of the ground state Ξb(5955)− with spin-[3/2]. We calculate the masses of the possible 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 Λb0 K− and Ξb−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 Ξb(6227)− is 1P orbitally excited state of the Ξb(5955)− baryon with quantum numbers JP=[3/2]−.
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