Search for the Production of Four Top Quarks in the Single-Lepton and Opposite-Sign Dilepton Final States in Proton-Proton Collisions at $\sqrt{s}=$ 13 TeV
(2019) Journal of High Energy Physics — Vol. 1911, p. 82 (2019)
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- A search for the standard model production of four top quarks (pp$\to\mathrm{t\overline{t}t\overline{t}}$) is reported using single-lepton plus jets and opposite-sign dilepton plus jets signatures. Proton-proton collisions are marc:recorded with the CMS detector at the LHC at a center-of-mass energy of 13\TeV in a sample corresponding to an integrated luminosity of 35.8 fb$^{-1}$. A multivariate analysis exploiting global event and jet properties is used to discriminate $\mathrm{t\overline{t}t\overline{t}}$ from $\mathrm{t\overline{t}}$ production. No significant deviation is observed from the predicted background. An upper limit is set on the cross section for $\mathrm{t\overline{t}t\overline{t}}$ production in the standard model of 48 fb at 95% confidence level. When combined with a previous measurement by the CMS experiment from an analysis of other final states, the observed signal significance is 1.4 standard deviations, and the combined cross section measurement is 13$^{+11}_{-9}$ fb. The result is also interpreted in the framework of effective field theory.
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Bondu, O., Bruno, G., Caputo, C., David, P., Delaere, C., Delcourt, M., Giammanco, A., Lemaitre, V., Magitteri, A., Prisciandaro, J., Saggio, A., Vidal Marono, M., Vischia, P., Zobec, J., CMS Collaboration, & et al. (2019). Search for the Production of Four Top Quarks in the Single-Lepton and Opposite-Sign Dilepton Final States in Proton-Proton Collisions at $\sqrt{s}=$ 13 TeV. Journal of High Energy Physics, 1911, 82. https://doi.org/10.1007/JHEP11(2019)082 (Original work published 2019)