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arXiv · 2005.12424

Interpretation of excited $Ω_b$ signals

Marek Karliner·Jonathan L. Rosner
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Abstract

Recently LHCb reported the discovery of four extremely narrow excited $Ω_b$ baryons decaying into $Ξ_b^0 K^-$. We interpret these baryons as bound states of a $b$-quark and a $P$-wave $ss$-diquark. For such a system there are exactly five possible combinations of spin and orbital angular momentum. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all with negative parity. We favor identifying the observed states as those those with spins 1/2 and 3/2, and give a range of predicted masses for the one with spin 5/2. We update earlier predictions for these states based on the five narrow excited $Ω_c$ states reported by LHCb. An alternative picture of the states in which one of $J=1/2$ is extremely wide and hence not seen by LHCb is discussed.

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Marek Karliner, Jonathan L. Rosner. 2020-07-10. Interpretation of excited $Ω_b$ signals. https://doi.org/10.1103/physrevd.102.014027

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