SMEFT Corrections to $Z$ Boson Decays

Abstract

We compute the one-loop corrections to $Z$ decay properties from dimension-6 operators in the Standard Model Effective Field Theory (SMEFT) that contribute also to anomalous 3-gauge boson couplings and examine the relative sensitivity of the two processes to the anomalous couplings. The size of the contributions is of order a few percent, of the same size as Standard Model electroweak corrections. This is part of a program of computing electroweak quantities to one-loop in the SMEFT: these calculations are needed for a future global fit to limit the coefficients of the dimension-six Wilson coefficients consistently at one loop.

22 pages, 2 figures. v2: minor changes, matches version published in PRD

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• Measurement of the properties of Higgs boson production at $\sqrt{s}=13$ TeV in the $H\to \gamma \gamma$ channel using $139$ fb${}^{-1}$ of $pp$ collision data with the ATLAS experiment
• SmeftFR -- Feynman rules generator for the Standard Model Effective Field Theory
• NLO corrections to $h\to b\bar{b}$ decay in SMEFT
• The Importance of Flavor in SMEFT Electroweak Precision Fits
• Top quark decay at next-to-leading order in the Standard Model Effective Field Theory
• Characters and Group Invariant Polynomials of (Super)fields: Road to "Lagrangian"
• Hilbert Series and Plethystics: Paving the path towards 2HDM- and MLRSM-EFT
• Monolepton production in SMEFT to $\mathcal{O}(1/{\Lambda }^4)$ and beyond
• To Profile or To Marginalize -- A SMEFT Case Study
• Four-lepton Z-boson decay constraints on the SMEFT
• Dijets at Tevatron Cannot Constrain SMEFT Four-Quark Operators
• Differential cross-section measurements of Higgs boson production in the $H\to {\tau }^{+}{\tau }^{-}$ decay channel in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Extended Higgs sectors, effective field theory and Higgs phenomenology
• Jet Substructure Measurements of Interference in Non-Interfering SMEFT Effects
• New Physics Through Drell Yan SMEFT Measurements at NLO
• From Models to SMEFT and Back?