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

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 or two 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 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 describing the interaction strengths of the operators. All five Wilson coefficients are simultaneously fit to data and 95% confidence level intervals are computed. All results are consistent with the SM expectations.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-21-001 (CMS Public Pages)

References in corpus (24)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Parton distributions for the LHC
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Particle-flow reconstruction and global event description with the CMS detector
• Pileup subtraction using jet areas
• Vector boson pair production at the LHC
• The CMS trigger system
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• Matter and Antimatter in the Universe
• Precision luminosity measurement in proton-proton collisions at $\sqrt{s}=$ 13 TeV in 2015 and 2016 at CMS
• Introduction to Effective Field Theory
• Performance of missing transverse momentum reconstruction in proton-proton collisions at $\sqrt{s}=$ 13 TeV using the CMS detector
• Higgs boson production in association with top quarks in the POWHEG BOX
• Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at $\sqrt{s}=$ 13 TeV
• Measurements of the pp $\to$ WZ inclusive and differential production cross section and constraints on charged anomalous triple gauge couplings at $\sqrt{s}=$ 13 TeV
• The Chromoelectric Dipole Moment of the Top Quark in Models with Vector Like Multiplets
• Measurements of the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a $Z$ boson at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for new physics in top quark production with additional leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV using effective field theory
• Measurements of inclusive and differential cross-sections of combined $t\bar{t}\gamma$ and $tW\gamma$ production in the $e\mu$ channel at 13 TeV with the ATLAS detector
• Resonance Searches with Machine Learned Likelihood Ratios

Cited by in corpus (10)

• On scientific understanding with artificial intelligence
• Unitarity Bounds on Effective Field Theories at the LHC
• Four-top quark physics at the LHC
• Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson
• Machine-Learning Performance on Higgs-Pair Production Associated with Dark Matter at the LHC
• LHC EFT WG Note: SMEFT predictions, event reweighting, and simulation
• Single-top quark physics at the LHC: from precision measurements to rare processes and top quark properties
• Probing top-quark electroweak couplings indirectly at the Electron-Ion Collider
• Testing the EFT paradigm with top quark final states in proton-proton collisions at LHC with ATLAS and CMS
• Measurement of high-mass $t\bar{t}{\ell }^{+}{\ell }^{-}$ production and lepton flavour universality-inspired effective field theory interpretations at $\sqrt{s}=13$ TeV with the ATLAS detector