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Determination of the possible quantum numbers for the newly observed Xi_b(6227)⁰ state

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arxiv 2012.01086 v2 pith:APLU4EQR submitted 2020-12-02 hep-ph hep-exhep-lat

Determination of the possible quantum numbers for the newly observed Xi_b(6227)⁰ state

classification hep-ph hep-exhep-lat
keywords stateexcitedbaryonnumbersobservedpossiblequantumrules
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The LHCb Collaboration recently reported the observation of a new excited bottom baryon $\Xi_b(6227)^0$ and announced an improvement in the measurements related to the previously observed $\Xi_b(6227)^-$ state. We conduct an analysis for $\Xi_b(6227)^0$ state considering it as isospin partner of the $\Xi_b(6227)^-$ resonance and possibly $1P$ or $2S$ excited state with spin $J=\frac{3}{2}$. The corresponding masses for both possibilities have consistent results with the experimental data, indicating that only with the mass sum rules, one can not make exact decision on the nature and quantum numbers of this state. To go further, the decays of these possible excited states to $\Xi_b^- \pi^+$ final state are also considered and the relevant strong coupling constants are extracted from the light cone sum rules. The obtained decay width values support the possibility of $\Xi_b(6227)^0$ to be the $1P$ excited state of $\Xi_b(5945)^0$ baryon.

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