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Observation of the Λ b 0 → J / ψ Λ ϕ decay in proton-proton collisions at s = 13 TeV

et al.
Abstract

The observation of the Λ b 0 → J / ψ Λ ϕ decay is reported using proton-proton collision data collected at s = 13 TeV by the CMS experiment at the LHC in 2018, corresponding to an integrated luminosity of 60 fb − 1 . The ratio of the branching fractions B ( Λ b 0 → J / ψ Λ ϕ ) / B ( Λ b 0 → ψ ( 2S ) Λ ) is measured to be ( 8.26 ± 0.90 (stat) ± 0.68 (syst) ± 0.11 ( B ) ) × 10 − 2 , where the first uncertainty is statistical, the second is systematic, and the last uncertainty reflects the uncertainties in the world-average branching fractions of ϕ and ψ ( 2S ) decays to the reconstructed final states.

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