In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2019, No. 11 ( 2019-11)
Abstract:
A search for the standard model production of four top quarks (pp → $$ \mathrm{t}\overline{\mathrm{t}}\mathrm{t}\overline{\mathrm{t}} $$ t t ¯ t t ¯ ) is reported using single-lepton plus jets and opposite-sign dilepton plus jets signatures. Proton-proton collisions are 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 $$ \mathrm{t}\overline{\mathrm{t}}\mathrm{t}\overline{\mathrm{t}} $$ t t ¯ t t ¯ from $$ \mathrm{t}\overline{\mathrm{t}} $$ t t ¯ production. No significant deviation is observed from the predicted background. An upper limit is set on the cross section for $$ \mathrm{t}\overline{\mathrm{t}}\mathrm{t}\overline{\mathrm{t}} $$ t t ¯ t 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 $$ {13}_{-9}^{+11} $$ 13 − 9 + 11 fb. The result is also interpreted in the framework of effective field theory.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP11(2019)082
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
2027350-2