${\mathit {\mathit t}}$-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 ${{\mathit d}_{{{t}}}}$ = ${{\mathit g}_{{{s}}}}\hat{{\mathit d}}_{t}/{\mathit m}_{{{\mathit t}}}$

INSPIRE   PDGID:
Q007CED
VALUE CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
$\vert \hat{{\mathit d}}_{t}\vert <0.015$ 95 1
TUMASYAN
2023J
 CMS ${{\mathit \ell}}$+jets
$-0.014<\hat{{\mathit d}}_{t}<0.027$ 95 2
TUMASYAN
2023U
 CMS dilepton channel; $\epsilon ({{\mathit p}_{{{t}}}}{{\mathit p}_{{{{{\overline{\mathit t}}}}}}}{{\mathit p}}_{{{\mathit \ell}^{+}}}{{\mathit p}}_{{{\mathit \ell}^{-}}}$)
$-0.019<\hat{{\mathit d}}_{t}<0.019$ 95 2
TUMASYAN
2023U
 CMS dilepton channel; $\epsilon ({{\mathit p}_{{{b}}}}{{\mathit p}_{{{{{\overline{\mathit b}}}}}}}{{\mathit p}}_{{{\mathit \ell}^{+}}}{{\mathit p}}_{{{\mathit \ell}^{-}}}$)
$\vert \hat{{\mathit d}}_{t}\vert <0.03$ 95 3
SIRUNYAN
2020AM
 CMS ${{\mathit \ell}}$+jets
$-0.020<\hat{{\mathit d}}_{t}<0.012$ 95 4
SIRUNYAN
2019BX
 CMS ${{\mathit \ell}}{{\mathit \ell}}$ + ${}\geq{}$2j (${}\geq{}1{{\mathit b}}$)
$-0.068<Im(\hat{{\mathit d}}_{t})<0.067$ 95 5
KHACHATRYAN
2016AI
 CMS ${{\mathit \ell}}{{\mathit \ell}}$ + ${}\geq{}$2j (${}\geq{}1{{\mathit b}}$)
1  TUMASYAN 2023J based on 138 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. Four $\mathit T$-odd triple products of momenta of the final-state particles are measured to constrain the dimensionless chromoelectric top quark dipole moment. No evidence of $\mathit CP$-violating effects is found, which is consistent with the SM expectation.
2  TUMASYAN 2023U based on 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. $\mathit CP$-odd Lorentz pseudo-scalar products ${{\mathit O}_{{{1}}}}$ = $\epsilon ({{\mathit p}_{{{t}}}}{{\mathit p}_{{{{{\overline{\mathit t}}}}}}}{{\mathit p}}_{{{\mathit \ell}^{+}}}{{\mathit p}}_{{{\mathit \ell}^{-}}}$) and ${{\mathit O}_{{{3}}}}$ = $\epsilon ({{\mathit p}_{{{b}}}}{{\mathit p}_{{{{{\overline{\mathit b}}}}}}}{{\mathit p}}_{{{\mathit \ell}^{+}}}{{\mathit p}}_{{{\mathit \ell}^{-}}}$) constructed from the momenta of ${{\mathit t}}$, ${{\overline{\mathit t}}}$, ${{\mathit \ell}^{+}}$, ${{\mathit \ell}^{-}}$ and of ${{\mathit b}}$, ${{\overline{\mathit b}}}$, ${{\mathit \ell}^{+}}$, ${{\mathit \ell}^{-}}$, respectively, are measured and used to constrain the dimensionless chromoelectric top quark dipole moment. No evidence for $\mathit CP$-violating effects is found, which is consistent with the SM expectation.
3  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 $\mathit A{}^{(1)}_{FB}$ = $0.048$ ${}^{+0.095}_{-0.087}{}^{+0.020}_{-0.029}$.
4  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.
5  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