Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Villalba, C.V.2024-11-152024-11-15202401434-604410.1140/epjc/s10052-024-13114-92-s2.0-85207098291https://doi.org/10.1140/epjc/s10052-024-13114-9https://hdl.handle.net/20.500.14517/7027Using proton–proton collision data corresponding to an integrated luminosity of 140fb-1 collected by the CMS experiment at s=13TeV, the Λb0→J/ψΞ-K+ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the Λb0→ψ(2S)Λ decay, is measured to be B(Λb0→J/ψΞ-K+)/B(Λb0→ψ(2S)Λ)=[3.38±1.02±0.61±0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in B(ψ(2S)→J/ψπ+π-) and B(Ξ-→Λπ-). © The Author(s) 2024.eninfo:eu-repo/semantics/openAccess[No Keyword Available]ArticleQ2Q18410