Observation of the Λ b 0 → J / ψ Ξ - K + and Ξ b 0 → J / ψ Ξ - π + decays
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10052_2025_Article_14129.pdf
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1.95 MB
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Checksum (MD5)
1a0df1b3698634ff4c3f81f7ce34fd18
Date Issued
July 28, 2025
Journal
The European Physical Journal C
Publisher
Springer Berlin Heidelberg
Citation
LHCb Collaboration. Observation of the Λ b 0 → J / ψ Ξ - K + and Ξ b 0 → J / ψ Ξ - π + decays. Eur. Phys. J. C 85, 812 (2025).
Version
Final published version
Abstract
The first observation of the Ξ b 0 → J / ψ Ξ - π + decay and the most precise measurement of the branching fraction of the Λ b 0 → J / ψ Ξ - K + decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13 \,Te V , corresponding to an integrated luminosity of 5.4 \,fb - 1 . Using the Λ b 0 → J / ψ Λ and Ξ b - → J / ψ Ξ - decays as normalisation channels, the ratios of branching fractions are measured to be B ( Λ b 0 → J / ψ Ξ - K + ) B ( Λ b 0 → J / ψ Λ ) = ( 1.17 ± 0.14 ± 0.08 ) × 10 - 2 , B ( Ξ b 0 → J / ψ Ξ - π + ) B ( Ξ b - → J / ψ Ξ - ) = ( 11.9 ± 1.4 ± 0.6 ) × 10 - 2 , where the first uncertainty is statistical and the second systematic.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-025-14129-6
