Probing for Extra Top Yukawa Couplings in Light of $t\bar{t}h(125)$ Observation

Abstract

The observation of $t\bar{t}h(125)$ production at the Large Hadron Collider (LHC) is the first direct measurement of the top Yukawa coupling. It opens the window on an extra top Yukawa coupling, ${\rho }_{tt}$, from a second Higgs doublet, without a $Z_2$ symmetry to forbid flavor changing neutral Higgs couplings. We show that $t\bar{t}h$ and Higgs property measurements at the High Luminosity LHC can constrain the $\mathrm{Re}{\rho }_{tt}$--$\mathrm{Im}{\rho }_{tt}$ parameter space that could drive electroweak baryogenesis, but the ${\Gamma }_h$ width measurement must be considerably improved beyond current projections.

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References in corpus (12)

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Cited by in corpus (12)

• Constraining the CP structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis
• Electroweak baryogenesis via bottom transport
• Constraining CP-violation in the Higgs-top-quark interaction using machine-learning-based inference
• Implications of Four-Top and Top-Pair Studies on Triple-Top Production
• The $tZH$ and $tZh$ production in 2HDM: Prospects for discovery at the LHC
• Flavor Changing Heavy Higgs Interactions with Leptons at Hadron Colliders
• The Role of the $t\bar{t}h$ Rest Frame in Direct Top-Quark Yukawa Coupling Measurements
• Probing an additional bottom Yukawa coupling via $bg\to bA\to bZH$ signature
• $\mathcal{C}\mathcal{P}$ structure of the top-quark Yukawa interaction: NLO QCD corrections and off-shell effects
• Decadal Mission for the New Physics Higgs/Flavor Era
• Sensitivity to $\mathcal{C}\mathcal{P}$-violating effective couplings in the top-Higgs sector
• The $R^2$-Higgs inflation with two Higgs doublets