• Editors' Suggestion
  • Open Access

First Observation of Excited Ωb States

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 124, 082002 – Published 25 February 2020

Abstract

We report four narrow peaks in the Ξb0K mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9fb1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ωb(6316)]=6315.64±0.31±0.07±0.50MeV, m[Ωb(6330)]=6330.30±0.28±0.07±0.50MeV, m[Ωb(6340)]=6339.71±0.26±0.05±0.50MeV, m[Ωb(6350)]=6349.88±0.35±0.05±0.50MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξb0 mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ωb(6316)]<2.8MeV, Γ[Ωb(6330)]<3.1MeV and Γ[Ωb(6340)]<1.5MeV. The natural width of the Ωb(6350) peak is 1.40.8+1.0±0.1MeV, which is 2.5σ from zero and corresponds to an upper limit of 2.8 MeV. The peaks have local significances ranging from 3.6σ to 7.2σ. After accounting for the look-elsewhere effect, the significances of the Ωb(6316) and Ωb(6330) peaks are reduced to 2.1σ and 2.6σ, respectively, while the two higher mass peaks exceed 5σ. The observed peaks are consistent with expectations for excited Ωb resonances.

  • Figure
  • Figure
  • Received 3 January 2020
  • Accepted 3 February 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.082002

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2020 CERN, for the LHCb Collaboration

Physics Subject Headings (PhySH)

  1. Physical Systems
Particles & Fields

Authors & Affiliations

Click to Expand

Article Text

Click to Expand

References

Click to Expand
Issue

Vol. 124, Iss. 8 — 28 February 2020

Reuse & Permissions
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

×

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×