Associated production of Intermediate Higgs or Z - boson with tt̄ pair in γγ collision

Associated production of Intermediate Higgs or Z-boson with t ¯ t pair in γγ collision ABSTRACT Photon-photon linear colliders can be realized by laser back-scattering technique on the next generation linear e + e − colliders. Here the associated productions of an intermediate mass Higgs (IMH) or Z-boson with t ¯ t pair in γγ collisions are studied. Since IMH is very unlikely to decay into t ¯ t pair, t ¯ tH production is the only direct channel to probe the Higgs-top Yukawa coupling in case of an IMH. t ¯ tZ production can be a potential background to t ¯ tH if the Higgs mass is close to m Z. As an alternative to its parent e + e − collider, γγ → t ¯ tH(Z) productions are compared with the corresponding productions in the e + e − collisions.