Interpretation of excited Ωb signals

Marek Karliner; Jonathan L. Rosner

doi:10.1103/PhysRevD.102.014027

Interpretation of excited Ωb signals

Marek Karliner
, Jonathan L. Rosner

School of Physics and Astronomy

The University of Chicago

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Recently LHCb reported the discovery of four extremely narrow excited Ωb baryons decaying into Ξ0bK−. 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 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 Ωc 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.

Original language	English
Article number	014027
Journal	Physical Review D
Volume	102
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.102.014027
State	Published - 1 Jul 2020

Funding

Funders	Funder number
NSFC-ISF	3423/19

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10.1103/PhysRevD.102.014027

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title = "Interpretation of excited Ωb signals",

abstract = "Recently LHCb reported the discovery of four extremely narrow excited Ωb baryons decaying into Ξ0bK−. 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 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 Ωc 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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N2 - Recently LHCb reported the discovery of four extremely narrow excited Ωb baryons decaying into Ξ0bK−. 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 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 Ωc 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.

AB - Recently LHCb reported the discovery of four extremely narrow excited Ωb baryons decaying into Ξ0bK−. 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 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 Ωc 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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Interpretation of excited Ωb signals

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