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Observation of two new excited Ξ0b states decaying to Λ0bK−π+

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LHCb Collaboration (Including:

Abdelmotteleb, A. S. W., Back, J. J., Beck, A., Blake, Thomas, Brossa Gonzalo, A., Cicala, M. F., Costa Sobral, C. M., Garcia Martin, L. M., Gershon, T. J., Hunter, R. J. et al.
). (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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Official URL: https://doi.org/10.1103/PhysRevLett.128.162001

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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:
DateEvent
21 April 2022Published
23 March 2022Accepted
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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