Probing top quark neutral couplings in the Standard Model Effective Field Theory at NLO QCD

Abstract

Top quark pair production in association with a $Z$-boson or a photon at the LHC directly probes neutral top-quark couplings. We present predictions for these two processes in the Standard Model (SM) Effective Field Theory (EFT) at next-to-leading (NLO) order in QCD. We include the full set of CP-even dimension-six operators that enter the top-quark interactions with the SM gauge bosons. For comparison, we also present predictions in the SMEFT for top loop-induced $HZ$ production at the LHC and for $t\bar{t}$ production at the ILC at NLO in QCD. Results for total cross sections and differential distributions are obtained and uncertainties coming from missing higher orders in the strong coupling and in the EFT expansions are discussed. NLO results matched to the parton shower are available, allowing for event generation to be directly employed in an experimental analyses. Our framework provides a solid basis for the interpretation of current and future measurements in the SMEFT, with improved accuracy and precision.

37 pages, 18 figures

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• Single-top associated production with a $Z$ or $H$ boson at the LHC: the SMEFT interpretation
• Measurement of top quark pair production in association with a Z boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Single Top Production at Next-to-Leading Order in the Standard Model Effective Field Theory
• The $Z$ decay width in the SMEFT: $y_t$ and $\lambda$ corrections at one loop
• NLO corrections to $h\to b\bar{b}$ decay in SMEFT
• Measurements of inclusive and differential fiducial cross-sections of $t\bar{t}\gamma$ production in leptonic final states at $\sqrt{s}$ = 13 TeV in ATLAS
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• One-loop Matching and Running with Covariant Derivative Expansion
• Effective Field Theory in the top sector: do multijets help?
• Study of top quark dipole interactions in $t\bar{t}$ production associated with two heavy gauge bosons at the LHC
• Probing the nonstandard top-gluon couplings through $t\bar{t}\gamma \gamma$ production at the LHC
• Top quark physics in the Large Hadron Collider era
• Signs of new physics in top quark pair production associated with a neutrino pair at the LHC
• Theoretical aspects of the study of top quark properties
• Top and Electroweak bosons and Higgs
• Measurements of inclusive and differential cross-sections of $t\bar{t}\gamma$ production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector