{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.145642.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2752469"}},{"@id":"https://doi.org/10.1140/epjc/s10052-024-13114-9","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"Using proton-proton collision data corresponding to an integrated luminosity of 140 fb$^{-1}$ collected by the CMS experiment at $\\sqrt{s}$ = 13 TeV, the $\\Lambda_\\text{b}^0$$\\to$ J/$\\psi\\Xi^-$K$^+$ decay is observed for the first time, with a statistical significance exceeding 5 standard deviations. The relative branching fraction, with respect to the $\\Lambda_\\text{b}^0$$\\to$$\\psi$(2S)$\\Lambda$ decay, is measured to be $\\mathcal{B}$($\\Lambda_\\text{b}^0$$\\to$ J/$\\psi\\Xi^-$K$^+$) / $\\mathcal{B}$( $\\Lambda_\\text{b}^0$$\\to$$\\psi$(2S)$\\Lambda$) = [3.38 $\\pm$ 1.02 $\\pm$ 0.61 $\\pm$ 0.03]%, where the first uncertainty is statistical, the second is systematic, and the third is related to the uncertainties in $\\mathcal{B}$($\\psi$(2S) $\\to$ J/$\\psi\\pi^+\\pi^-$) and $\\mathcal{B}$($\\Xi^-$ $\\to$ $\\Lambda\\pi^-$).","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.145642.v1/t1","@type":"Dataset","description":"The measured branching fraction ratio","name":"Table 1. Results for the ratio of braching fractions"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2752469?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/145642"}],"inLanguage":"en","name":"Observation of the $\\Lambda_\\text{b}^0\\to J/\\psi\\Xi^-K^+$ decay","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2752469?version=1","version":1}