Top quark anomalous tensor couplings in the two-Higgs-doublet models

Abstract

We compute the one loop right and left anomalous tensor couplings ($g_R$ and $g_L$, respectively) for the top quark, in the aligned two-Higgs-doublet model. They are the magnetic-like couplings in the most general parameterization of the $tbW$ vertex. We find that the aligned two-Higgs doublet model, that includes as particular cases some of the most studied extensions of the Higgs sector, introduces new electroweak contributions and provides theoretical predictions that are very sensitive to both new scalar masses and the neutral scalar mixing angle. For a large area in the parameters space we obtain significant deviations in both the real and the imaginary parts of the couplings $g_R$ and $g_L$, compared to the predictions given by the electroweak sector of the Standard Model. The most important ones are those involving the imaginary part of the left coupling $g_L$ and the real part of the right coupling $g_R$. The real part of $g_L$ and the imaginary part of $g_R$ also show an important sensitivity to new physics scenarios. The model can also account for new CP violation effects via the introduction of complex alignment parameters that have important consequences on the values for the imaginary parts of the couplings. The top anomalous tensor couplings will be measured at the LHC and at future colliders providing a complementary insight on new physics, independent from the bounds in top decays coming from B physics and $b\to s\gamma$.

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Cited by in corpus (13)

• Electric Dipole Moments in Two-Higgs-Doublet Models
• $B_{s,d}^0\to {\ell }^{+}{\ell }^{-}$ Decays in the Aligned Two-Higgs-Doublet Model
• Flavour alignment in multi-Higgs-doublet models
• $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ Decay in the Aligned Two-Higgs-Doublet Model
• Search for anomalous couplings in the $Wtb$ vertex from the measurement of double differential angular decay rates of single top quarks produced in the $t$-channel with the ATLAS detector
• Probing anomalous $Wtb$ couplings at the LHC in single top quark production through $t$-channel
• LHC bounds on coloured scalars
• Loop induced $H^{\pm }\to W^{\pm }Z$ decays in the aligned two-Higgs-doublet model
• $tbW$ Anomalous Couplings in the Two Higgs Doublet Model
• Top and bottom tensor couplings from a color octet scalar
• The right top coupling in the aligned two-Higgs-doublet model
• Rare top-quark decays $t\to cg(g)$ in the aligned two-Higgs-doublet model
• Flavour-changing top decays in the aligned two-Higgs-doublet model