Exploring the Anomalous Higgs-top Couplings

Abstract

Top quark with its large Yukawa coupling is crucially important to explore TeV scale physics. Therefore, the study of Higgs-top sector is highly motivated to look for any deviations from the standard model predictions. The most general lowest order Lagrangian for the Higgs-top Yukawa coupling has scalar ($\kappa$) and pseudoscalar ($\tilde{\kappa }$) components. Currently, these couplings are constrained indirectly using the present experimental limits on the Higgs-$\gamma$-$\gamma$ and Higgs-gluon-gluon couplings. Furthermore, stronger bounds on $\kappa$ and $\tilde{\kappa }$ are obtained using the limits on the electric dipole moments (EDM). In this work, we propose an asymmetry-like observable $O_{\varphi }$ in $t\bar{t}H$ production at the LHC to probe the Higgs-top coupling and to distinguish between the scalar and pseudoscalar components. We also show that the presence of the pseudoscalar component in the Higgs-top Yukawa coupling leads to a sizeable value for the top quark EDM. It is shown that a limit of $10^{-19}$ e.cm, which is achievable by the future $e^{-}{e}^{+}$ collider, allows us to exclude a significant region in the $(\kappa ,\tilde{\kappa })$ plane.

15 pages, 8 figures

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• Probing the top-Higgs coupling through the secondary lepton distributions in the associated production of the top-quark pair and Higgs boson at the LHC
• Prospect study for measurement of $Hb\bar{b}$ coupling at the LHC and FCC-hh
• Exploring non-standard $Hb\bar{b}$ interactions at future electron-proton colliders
• Asymmetries in invisible Dark Matter mediator production associated with $t\bar{t}$ final states