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Measurement of the $t\bar{t}Z$ and $t\bar{t}W$ cross sections in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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abstract
A measurement of the associated production of a top-quark pair ($t\bar{t}$) with a vector boson ($W$, $Z$) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using $36.1$ fb$^{-1}$ of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The $t\bar{t}Z$ and $t\bar{t}W$ production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are $\sigma_{t\bar{t}Z} = 0.95 \pm 0.08_{\mathrm{stat.}} \pm 0.10_{\mathrm{syst.}}$ pb and $\sigma_{t\bar{t}W} = 0.87 \pm 0.13_{\mathrm{stat.}} \pm 0.14_{\mathrm{syst.}}$ pb in agreement with the Standard Model predictions. The measurement of the $t\bar{t}Z$ cross section is used to set constraints on effective field theory operators which modify the $t\bar{t}Z$ vertex.
Forward citations
Cited by 7 Pith papers
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A search for electroweak $t\bar{t}Wj$ production in multileptonic final states at $\sqrt{s} = 13$ TeV with the ATLAS detector and bounds on effective field theory operators
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Two-loop Feynman integrals for leading colour $t\bar{t}W$ production at hadron colliders
A complete set of two-loop master integrals for leading-colour ttW production is reduced to differential equations that are at most quadratic in the dimensional regulator and evaluated numerically in the physical region.
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Renormalisation group evolution effects on global SMEFT analyses
Including RGE effects in a global SMEFT fit improves bounds on poorly constrained four-quark operators but weakens limits on modified Z q qbar couplings by up to a factor of ten.
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Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $\sqrt{s} =$ 13 TeV
CMS measures the four-top-quark production cross section to be 12.6 +5.8 -5.2 fb with an observed significance of 2.6 standard deviations, consistent with the standard model prediction of 12.0 fb.
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Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s} =$ 13 TeV
CMS sets new 95% CL upper limits on the top-quark coupling of scalar and pseudoscalar Higgs bosons with masses from 400 to 750 GeV, and reports a 1.9 sigma excess near 400 GeV.
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Analyzing $t\bar{t}Z$-couplings at the future $e^-p$ collider
At a future LHeC, the azimuthal angle between the scattered electron and the lepton from top decay could constrain the ttbarZ axial coupling to about 8% and the vector coupling to about 68% precision at 95% CL with 10...
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Fingerprinting New Physics with Effective Field Theories
A thesis compiling published SMEFT global fits, automated UV-model constraints, and ML-based unbinned observables, with projections for HL-LHC, FCC-ee, and CEPC.
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