Abstract
Photon-photon linear colliders can be realized by the laser back-scattering technique in the next-generation linear ${e}^{+}{e}^{\ensuremath{-}}$ colliders. Here the associated productions of an intermediate-mass Higgs (IMH) or $Z$ boson with a $t\overline{t}$ pair in $\ensuremath{\gamma}\ensuremath{\gamma}$ collisions are studied. Since IMH is very unlikely to decay into a $t\overline{t}$ pair, $t\overline{t}H$ production is the only direct channel to probe the Higgs-top Yukawa coupling in the case of an IMH. $t\overline{t}Z$ production can be a potential background to $t\overline{t}H$ if the Higgs mass is close to ${m}_{Z}$. As an alternative to its parent ${e}^{+}{e}^{\ensuremath{-}}$ collider, $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}t\overline{t}H(Z)$ productions are compared with the corresponding productions in the ${e}^{+}{e}^{\ensuremath{-}}$ collisions.
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