{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.138420.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2661880"}},{"@id":"https://doi.org/10.1016/j.physletb.2023.138290","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2023","description":"The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016-2018 at the CERN LHC and corresponding to an integrated luminosity of 138 $\\text{fb}^{-1}$.Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed.Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of $b$ quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis.Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be $17.6^{+3.7}_{-3.5} \\text{(stat)} ^{+2.3}_{-1.9} \\text{(syst)}$, in agreement with the available theoretical predictions.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.138420.v1/t1","@type":"Dataset","description":"Comparison of fit results in the channels individually and in their combination. The left panel shows the values of the...","name":"Figure 8"},{"@id":"https://doi.org/10.17182/hepdata.138420.v1/t2","@type":"Dataset","description":"Number of predicted and observed events in the SR-2$\\ell$ and SR-3$\\ell$ $t\\bar{t}t\\bar{t}$ classes, both before the fit to the data...","name":"Table 3"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2661880?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/138420"}],"inLanguage":"en","name":"Observation of four top quark production in proton-proton collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2661880?version=1","version":1}