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The observation of $t\bar th(125)$ production at the Large Hadron Collider(LHC) is the first direct measurement of the top Yukawa coupling. It opens thewindow on an extra top Yukawa coupling, $\rho_{tt}$, from a second Higgsdoublet, without a $Z_2$ symmetry to forbid flavor changing neutral Higgscouplings. We show that $t\bar th$ and Higgs property measurements at the HighLuminosity LHC can constrain the ${\rm Re}\,\rho_{tt}$--${\rm Im}\,\rho_{tt}$parameter space that could drive electroweak baryogenesis, but the $\Gamma_h$width measurement must be considerably improved beyond current projections.

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