Top quark tensor couplings

Abstract

We compute the real and imaginary parts of the one-loop electroweak contributions to the left and right tensorial anomalous couplings of the $tbW$ vertex in the Standard Model (SM). For both tensorial couplings we find that the real part of the electroweak SM correction is close to 10 of the leading contribution given by the QCD gluon exchange. We also find that the electroweak real and imaginary parts for the anomalous right coupling are almost of the same order of magnitude. The one loop SM prediction for the real part of the left coupling is close to the 3$\sigma$ discovery limit derived from $b\to s\gamma$. Besides, taking into account that the predictions of new physics interactions are also at the level of a few percents when compared with the one loop QCD gluon exchange, these electroweak corrections should be taken into account in order to disentangle new physics effects from the standard ones. These anomalous tensorial couplings of the top quark will be investigated at the LHC in the near future where sensitivity to these contributions may be achieved.

16 pages, 2 figures

References in corpus (7)

• Single top quark production at LHC with anomalous Wtb couplings
• Probing anomalous Wtb couplings in top pair decays
• W polarisation beyond helicity fractions in top quark decays
• ATLAS sensitivity to Wtb anomalous couplings in top quark decays
• The Top Quark Decay Vertex in Standard Model Extensions
• Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production
• Search for anomalous top quark couplings with the D0 detector

Cited by in corpus (18)

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• Right-handed charged currents in the era of the Large Hadron Collider
• Constraining top quark effective theory in the LHC Run II era
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• Probing the $Wtb$ vertex structure in $t$-channel single-top-quark production and decay in $pp$ collisions at $\sqrt{\mathrm{s}}=8$ TeV with the ATLAS detector
• Probing anomalous $Wtb$ couplings at the LHC in single top quark production through $t$-channel
• Top quark anomalous tensor couplings in the two-Higgs-doublet models
• Effective Field Theory in the top sector: do multijets help?
• $tbW$ Anomalous Couplings in the Two Higgs Doublet Model
• Modeling of anomalous Wtb interactions using subsidiary fields
• Full analysis of general non-standard tbW couplings
• Top and bottom tensor couplings from a color octet scalar
• $T$-odd correlations in polarized top quark decays in the sequential decay $t(\uparrow )\to X_b+W^{+}(\to {\ell }^{+}+{\nu }_{\ell })$ and in the quasi three-body decay $t(\uparrow )\to X_b+{\ell }^{+}+{\nu }_{\ell }$
• Measurement of the polarisation of single top quarks and antiquarks produced in the $t$-channel at $\sqrt{s}=13$ TeV and bounds on the $tWb$ dipole operator from the ATLAS experiment
• The right top coupling in the aligned two-Higgs-doublet model
• Positivity bound on the imaginary part of the right-chiral tensor coupling $g_R$ in polarized top quark decay
• Bread and butter physics: NLO electroweak corrections to polarized top quark decays
• NLO and NNLO corrections to polarized top quark decays