Observation of two new excited Ξ0 b states decaying to Λ0b K- π+
Two narrow resonant states are observed in the Λ0bK−π+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb−1. The minimal quark content of the Λ0bK−π+ system indicat...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
21 April 2022
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| In: |
Physical review letters
Year: 2022, Jahrgang: 128, Heft: 16, Pages: 1-12 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.128.162001 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.128.162001 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.128.162001 
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| Verfasserangaben: | the LHCb Collaboration |
MARC
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| 110 | 2 | |a LHCb Collaboration |e VerfasserIn |0 (DE-588)1166245764 |0 (DE-627)1030265593 |0 (DE-576)510686508 |4 aut | |
| 245 | 1 | 0 | |a Observation of two new excited Ξ0 b states decaying to Λ0b K- π+ |c the LHCb Collaboration |
| 246 | 3 | 3 | |a Observation of two new excited xi zero b states decaying to lambda zero b K- pi+ |
| 246 | 3 | 3 | |a Observation of two new excited Ξ 0 b states decaying to Λ 0 b K - π + |
| 264 | 1 | |c 21 April 2022 | |
| 300 | |a 12 | ||
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| 337 | |a Computermedien |b c |2 rdamedia | ||
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| 500 | |a The LHCb Collaboration: R. Aaij, F Archilli, S. Bachmann, D. Berninghoff, M. Borsato, G. Frau, J.P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, P. Li, J. Marks, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, A. Zhelezov [und viele weitere] | ||
| 500 | |a Gesehen am 11.07.2022 | ||
| 500 | |a Im Titel sind "0", "+" und "-" jeweils hochgestellt, "b" ist jeweils tiefgestellt | ||
| 520 | |a Two narrow resonant states are observed in the Λ0bK−π+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb−1. The minimal quark content of the Λ0bK−π+ system indicates that these are excited Ξ0b baryons. The masses of the Ξb(6327)0 and Ξb(6333)0 states are m[Ξb(6327)0]=6327.28+0.23−0.21±0.12±0.24 and m[Ξb(6333)0]=6332.69+0.17−0.18±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41+0.26−0.27±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λ0b mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξb(6327)0]<2.20(2.56) and Γ[Ξb(6333)0]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξ0b resonances. | ||
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