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Observation of two new excited Ξ0b states decaying to Λ0bK−π+
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LHCb Collaboration (Including:
). (2022) Observation of two new excited Ξ0b states decaying to Λ0bK−π+. Physical Review Letters, 128 (16). 162001. doi:10.1103/PhysRevLett.128.162001 ISSN 0031-9007.
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WRAP-Observation-two-new-excited-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (388Kb) | Preview |
Official URL: https://doi.org/10.1103/PhysRevLett.128.162001
Abstract
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.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Physical Review Letters | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 0031-9007 | ||||||
| Official Date: | 21 April 2022 | ||||||
| Dates: |
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| Volume: | 128 | ||||||
| Number: | 16 | ||||||
| Article Number: | 162001 | ||||||
| DOI: | 10.1103/PhysRevLett.128.162001 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Copyright Holders: | © 2022 CERN, for the LHCb Collaboration | ||||||
| Date of first compliant deposit: | 28 June 2022 | ||||||
| Date of first compliant Open Access: | 28 June 2022 |
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