Prospects for the determination of the top-quark Yukawa coupling at future $e^+e^-$ colliders

Understand

We estimate the sensitivity to the top-quark Yukawa coupling $y_t$ at future $e^+e^-$ colliders.

• We go beyond the standard approach that focuses on $t\bar t h$ production and consider final states with a Higgs boson but not top quarks.
• The sensitivity to $y_t$ in such processes comes from the coupling of the Higgs boson to top quarks in loops.
• Such final states can be produced in significant numbers at center-of-mass energies that will be accessible by all proposed $e^+e^-$ colliders.