${\mathit {\mathit t}}$-quark EW Couplings

${{\mathit W}}$ helicity fractions in top decays. ${{\mathit F}_{{0}}}$ is the fraction of longitudinal and ${{\mathit F}_{{+}}}$ the fraction of right-handed ${{\mathit W}}$ bosons. ${{\mathit F}_{{{V+A}}}}$ is the fraction of $\mathit V+\mathit A$ current in top decays. The effective Lagrangian (cited by ABAZOV 2008AI) has terms f${}^{L}_{1}$ and f${}^{R}_{1}$ for $\mathit V−\mathit A$ and $\mathit V+\mathit A$ couplings, f${}^{L}_{2}$ and f${}^{R}_{2}$ for tensor couplings with b$_{R}$ and b$_{L}$ respectively.

Chromo-electric dipole moment ${{\mathit d}_{{t}}}$ = ${{\mathit g}_{{s}}}\hat{{\mathit d}}_{t}/{{\mathit m}_{{t}}}$

INSPIRE   PDGID:
Q007CED
VALUE CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$\vert \hat{{\mathit d}}_{t}\vert <0.03$ 95 1
SIRUNYAN
2020AM
 CMS ${{\mathit \ell}}$ +jets
$-0.020<\hat{{\mathit d}}_{t}<0.012$ 95 2
SIRUNYAN
2019BX
 CMS ${{\mathit \ell}}{{\mathit \ell}}$ + ${}\geq{}$2j (${}\geq{}1{{\mathit b}}$)
$-0.068<Im(\hat{{\mathit d}}_{t})<0.067$ 95 3
KHACHATRYAN
2016AI
 CMS ${{\mathit \ell}}{{\mathit \ell}}$ + ${}\geq{}$2j (${}\geq{}1{{\mathit b}}$)
1  SIRUNYAN 2020AM based on 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. ${{\mathit t}}{{\overline{\mathit t}}}$ with low and high boosts are reconstructed through a fit of the kinematic distributions. The ${{\mathit q}}{{\overline{\mathit q}}}$ initial subprocess is separated using different dependences of the distributions on the initial states, and the linearized forward-backward asymmetry is measured to be $\mathit A{}^{(1)}_{FB}$ = $0.048$ ${}^{+0.095}_{-0.087}{}^{+0.020}_{-0.029}$.
2  SIRUNYAN 2019BX based on 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. A set of parton-level normalized differential cross sections is measured to extract coefficients of the spin-dependent ${{\mathit t}}{{\overline{\mathit t}}}$ production density matrix and constrain the anomalous chromomagnetic and chromoelectric dipole moments of the top quark. The coefficients are compared with the NLO MC simulations and with the NLO QCD calculation including EW corrections.
3  KHACHATRYAN 2016AI based on 19.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV, using lepton angular distributions as a function of the ${{\mathit t}}{{\overline{\mathit t}}}$ -system kinematical variables.
References:
SIRUNYAN 2020AM
JHEP 2006 146 Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at $ \sqrt{s} $ = 13 TeV
SIRUNYAN 2019BX
PR D100 072002 Measurement of the top quark polarization and $\mathrm{t\bar{t}}$ spin correlations using dilepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV
KHACHATRYAN 2016AI
PR D93 052007 Measurements of ${\mathit {\mathit t}}{\mathit {\overline{\mathit t}}}$ Spin Correlations and Top Quark Polarization using Dilepton Final States in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV