{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.158454.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3072016"}},{"@id":"https://doi.org/10.1103/rk6w-1pcl","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2025","description":"The first observation of single top quark production in association with a W and a Z boson in proton-proton collisions is reported. The analysis uses data at center-of-mass energies of 13 and 13.6 TeV recorded with the CMS detector at the CERN LHC, corresponding to a total integrated luminosity of 200 fb$^{-1}$. Events with three or four charged leptons, which can be electrons or muons, are selected. Advanced machine-learning algorithms and improved reconstruction methods, compared to an earlier analysis, result in an unprecedented sensitivity to tWZ production. The measured cross sections for tWZ production are 248 $\\pm$ 52 fb and 242 $\\pm$ 77 fb for $\\sqrt{s}$ = 13 and 13.6 TeV, respectively. The signal is established with a statistical significance of 5.8 standard deviations, with 3.5 expected, compared to the background-only hypothesis.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.158454.v1/t1","@type":"Dataset","description":"Distributions in the ML output scores for the tWZ output node in the 3l SR after a fit to the...","name":"Figure_002-a"},{"@id":"https://doi.org/10.17182/hepdata.158454.v1/t2","@type":"Dataset","description":"Distributions in the ML output scores for the ttZ output node in the 3l SR after a fit to the...","name":"Figure_002-b"},{"@id":"https://doi.org/10.17182/hepdata.158454.v1/t3","@type":"Dataset","description":"Distributions in the ML output scores for the tWZ output node in the 4l SR after a fit to the...","name":"Figure_002-c"},{"@id":"https://doi.org/10.17182/hepdata.158454.v1/t4","@type":"Dataset","description":"Distributions in the trailing lepton pt for the DY CR after a fit to the data.","name":"Figure_004-a"},{"@id":"https://doi.org/10.17182/hepdata.158454.v1/t5","@type":"Dataset","description":"Distributions in the trailing lepton pt for the tt CR after a fit to the data.","name":"Figure_004-b"},{"@id":"https://doi.org/10.17182/hepdata.158454.v1/t6","@type":"Dataset","description":"Likelihood scan of the signal strengths for tWZ and ttZ production. The black cross shows the best fit value, while...","name":"Figure_003"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3072016?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/158454"}],"inLanguage":"en","name":"Observation of tWZ production at the CMS experiment","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3072016?version=1","version":1}