Compact Muon Solenoid
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| CMS-PAS-TOP-21-001 | ||
| Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| June 2021 | ||
| Abstract: A search for new top quark interactions is performed within the framework of an effective field theory using the associated production of either one ($\mathrm{t}\mathrm{Z}$) or two ($\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$) top quarks with a Z boson in multilepton final states. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = $ 13 TeV, collected by the CMS experiment at the CERN LHC. Five dimension-six operators modifying the electroweak interactions of the top quark are considered. Novel machine-learning techniques are used to enhance the sensitivity to effects arising from these operators. Distributions used for the signal extraction are parameterized in terms of Wilson coefficients (WCs) describing the interaction strengths of the operators. All five WCs are fit to the data and confidence intervals at 95% confidence level are computed. All intervals contain the standard model expectations for the WC values. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 12 (2021) 083. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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