Observation of a New Ξ_{b}^{-} Resonance

Physical Review Letters
R AaijLHCb Collaboration

Abstract

From samples of pp collision data collected by the LHCb experiment at sqrt[s]=7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5  fb^{-1}, respectively, a peak in both the Λ_{b}^{0}K^{-} and Ξ_{b}^{0}π^{-} invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξ_{b}^{-} resonances with quark content bds are expected. Referring to this peak as Ξ_{b}(6227)^{-}, the mass and natural width are measured to be m_{Ξ_{b}(6227)^{-}}=6226.9±2.0±0.3±0.2  MeV/c^{2} and Γ_{Ξ_{b}(6227)^{-}}=18.1±5.4±1.8  MeV/c^{2}, where the first uncertainty is statistical, the second is systematic, and the third, on m_{Ξ_{b}(6227)^{-}}, is due to the knowledge of the Λ_{b}^{0} baryon mass. Relative production rates of the Ξ_{b}(6227)^{-}→Λ_{b}^{0}K^{-} and Ξ_{b}(6227)^{-}→Ξ_{b}^{0}π^{-} decays are also reported.

References

Sep 26, 2012·Physical Review Letters·S ChatrchyanUNKNOWN CMS Collaboration
Dec 12, 2012·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration
Aug 2, 2014·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration
Feb 28, 2015·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration

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Citations

Nov 9, 2019·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration
Dec 1, 2018·Physical Review Letters·Nilmani MathurSourav Mondal
Mar 14, 2020·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration
Jul 10, 2021·Physical Review Letters·A M SirunyanUNKNOWN CMS Collaboration

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