Observation of a new Ξ b 0 state
Name
PhysRevD.103.012004.pdf
Description
Published version
Size
577.23 KB
Format
Adobe PDF
Checksum (MD5)
740d68b9f17c3273764b748cf19df511
Author(s)
Williams, Michael
Date Issued
2021
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2021. "Observation of a new Ξ b 0 state." Physical Review D, 103 (1).
Version
Final published version
Abstract
© 2021 CERN. Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5 fb-1, the observation of a new excited Ξb0 resonance decaying to the Ξb-π+ final state is presented. The state, referred to as Ξb(6227)0, has a measured mass and natural width of m(Ξb(6227)0)=6227.1-1.5+1.4±0.5 MeV and Γ(Ξb(6227)0)=18.6-4.1+5.0±1.4 MeV, where the uncertainties are statistical and systematic. The production rate of the Ξb(6227)0 state relative to that of the Ξb- baryon in the kinematic region 2<η<5 and pT<30 GeV is measured to be fΞb(6227)0fΞb-B(Ξb(6227)0→Ξb-π+)=0.045±0.008±0.004, where B(Ξb(6227)0→Ξb-π+) is the branching fraction of the decay, and fΞb(6227)0 and fΞb- represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed Ξb(6227)- state, along with the mass of the Ξb- baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.103.012004
