Unitarity and anomalous top-quark Yukawa couplings

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Abstract
Unitarity constraints on anomalous top-quark–Higgs-boson couplings are examined. In the calculation, we consider all tt¯ and two-boson channels and obtain the maximal value of the coupled channel amplitude, which sets the unitarity condition. We compare the unitarity constraints with the constraints from electroweak baryogenesis and electric dipole moments derived earlier. Tighter constraints can be obtained by including a tt¯HH contract term which arises from one realization of our effective interaction.
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