First observation of the decay Λ b 0 → η c ( 1 S ) p K −
Name
PhysRevD.102.112012.pdf
Description
Published version
Size
380.73 KB
Format
Adobe PDF
Checksum (MD5)
d99e0f54d0ced8b729504810bf3b1103
Author(s)
Williams, Michael
Date Issued
2020
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2020. "First observation of the decay Λ b 0 → η c ( 1 S ) p K −." Physical Review D, 102 (11).
Version
Final published version
Abstract
© 2020 CERN. The decay Λb0→ηc(1S)pK- is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 fb-1, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Λb0→J/ψpK- decay as a normalization mode, to be B(Λb0→ηc(1S)pK-)=(1.06±0.16±0.06-0.19+0.22)×10-4, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the ηc(1S)p mass spectrum is performed to search for the Pc(4312)+ pentaquark state. No evidence is observed and an upper limit of B(Λb0→Pc(4312)+K-)×B(Pc(4312)+→ηc(1S)p)B(Λb0→ηc(1S)pK-)<0.24 is obtained at the 95% confidence level.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.102.112012
