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Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be $24^{+7}_{-6}$ fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.100170.v1/t1","@type":"Dataset","description":"The results of fitted inclusive ${t\\bar{t}t\\bar{t}}$ cross-section","name":"Fitted cross section"},{"@id":"https://doi.org/10.17182/hepdata.100170.v1/t2","@type":"Dataset","description":"The results of the fitted signal strength $\\mu$","name":"Fitted $\\mu$"},{"@id":"https://doi.org/10.17182/hepdata.100170.v1/t3","@type":"Dataset","description":"List of the uncertainties in the signal strength $\\mu$, grouped in categories. The quoted values are obtained by repeating the...","name":"Fitted mu uncertainties"},{"@id":"https://doi.org/10.17182/hepdata.100170.v1/t4","@type":"Dataset","description":"Post-fit background and signal yields in the full signal region. 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