Top quark decay at next-to-leading order in the Standard Model Effective Field Theory

Abstract

We consider top quark decay in the Standard Model Effective Field Theory (SMEFT). We present a calculation of the total decay width and the $W$-boson helicity fractions at next-to-leading order (NLO) in SMEFT. Our result includes the complete set of contributing four-fermion operators in addition to QCD dipole operators and bottom-mass suppressed effects. We show that operators that first appear at NLO in the SMEFT can be bounded by the current data as well as future data from both a high-luminosity LHC and a potential $e^{+}{e}^{-}$ collider, demonstrating the importance of going beyond leading order when studying the SMEFT. We discuss technical aspects of our calculation that we believe will be useful in future higher-order studies of the SMEFT, in particular the treatment of ${\gamma }_5$ in loop diagrams.

arXiv comment26 pages, 7 figures; fixed Latex formatting issue affecting equations A.35-A.37

References in corpus (48)

• Dimension-Six Terms in the Standard Model Lagrangian
• Renormalization Group Evolution of the Standard Model Dimension Six Operators III: Gauge Coupling Dependence and Phenomenology
• Renormalization Group Evolution of the Standard Model Dimension Six Operators II: Yukawa Dependence
• Renormalization Group Evolution of the Standard Model Dimension Six Operators I: Formalism and lambda Dependence
• The renormalization of the axial anomaly in dimensional regularization
• Effective Theory Analysis of Precision Electroweak Data
• A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector
• Matching QCD and HQET heavy--light currents at two loops and beyond
• Complete Higgs Sector Constraints on Dimension-6 Operators
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• Towards the Ultimate SM Fit to Close in on Higgs Physics
• Constraining the top-Higgs sector of the Standard Model Effective Field Theory
• Model-independent precision constraints on dimension-6 operators
• Evanescent Operators, Scheme Dependences and Double Insertions
• Facts of life with gamma(5)
• Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
• Constraining top quark effective theory in the LHC Run II era
• Feynman Rules for the Standard Model Effective Field Theory in $R_{\xi }$-gauges
• Yukawa coupling beta-functions in the Standard Model at three loops
• Towards consistent Electroweak Precision Data constraints in the SMEFT
• On one-loop corrections in the standard model effective field theory; the $\Gamma (h\to \gamma \gamma )$ case
• Higgs decay to two photons at one-loop in the SMEFT
• Probing top-Higgs non-standard interactions at the LHC
• Electroweak Effective Operators and Higgs Physics
• Higgs Decays to $ZZ$ and $Z\gamma$ in the SMEFT: an NLO analysis
• Interpreting top-quark LHC measurements in the standard-model effective field theory
• Electroweak and finite width corrections to top quark decays into transverse and longitudinal $W$-bosons
• SMEFT and the Drell-Yan Process at High Energy
• Effective field theory approach to top-quark decay at next-to-leading order in QCD
• The $Z$ decay width in the SMEFT: $y_t$ and $\lambda$ corrections at one loop
• Constraints on Non-standard Top Quark Couplings
• Longitudinal, transverse-plus and transverse-minus W-bosons in unpolarized top quark decays at O(alpha_s)
• Dimension-six electroweak top-loop effects in Higgs production and decay
• Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at sqrt(s) = 8 TeV
• One-loop corrections to $h\to b\bar{b}$ and $h\to \tau \bar{\tau }$ decays in the Standard Model Dimension-6 EFT: four-fermion operators and the large-$m_t$ limit
• The decay $h\to \gamma \gamma$ in the Standard-Model Effective Field Theory
• Electroweak Corrections to Higgs to $\gamma \gamma$ and $W^{+}{W}^{-}$ in the SMEFT
• NLO corrections to $h\to b\bar{b}$ decay in SMEFT
• QCD radiative corrections for $h\to b\bar{b}$ in the Standard Model Dimension-6 EFT
• SMEFT Corrections to $Z$ Boson Decays
• Effective Field Theory for Nonstandard Top Quark Couplings
• Precision Electroweak Analysis after the Higgs Boson Discovery
• The Standard Model Effective Field Theory and Next to Leading Order
• Off-shell single-top-quark production in the Standard Model Effective Field Theory
• Effective operators in $t$-channel single top production and decay
• FeynCalc 9
• Renormalization of four-quark operators, effective theory, and the role of evanescent operators
• Three-loop beta-functions and anomalous dimensions in the Standard Model

Cited by in corpus (21)

• O new physics, where art thou? A global search in the top sector
• Low-energy effective field theory below the electroweak scale: matching at one loop
• Electroweak and QCD Corrections to $Z$ and $W$ pole observables in the SMEFT
• Role of dimension-eight operators in an EFT for the 2HDM
• The Importance of Flavor in SMEFT Electroweak Precision Fits
• SmeftFR v3 -- Feynman rules generator for the Standard Model Effective Field Theory
• Higgs decay to fermion pairs at NLO in SMEFT
• New flavor physics in di- and tri-lepton events from single-top at the LHC and beyond
• Loop counting matters in SMEFT
• Electroweak input schemes and universal corrections in SMEFT
• Computing Tools for Effective Field Theories
• Renormalization and non-renormalization of scalar EFTs at higher orders
• Effective field theory and scalar extensions of the top quark sector
• Multi-lepton probes of new physics and lepton-universality in top-quark interactions
• High $p_T$ correlated tests of lepton universality in lepton(s) + jet(s) processes; an EFT analysis
• Top-pair production via gluon fusion in the Standard Model Effective Field Theory
• New method for fitting coefficients in standard model effective theory
• New Physics Through Drell Yan SMEFT Measurements at NLO
• Single-spin measurements and heavy new physics in the $e^{+}{e}^{-}\to t\bar{t}$ process at an FCC-ee
• W-boson helicity fractions in top decay as probes of dimension-6 and dimension-8 SMEFT operators
• Flavorful Electroweak Precision Observables in the Standard Model Effective Field Theory