Heavy physics effects on Higgs production at gamma gamma colliders

We study heavy physics effects on the Higgs boson production in gamma gamma fusion using the effective Lagrangian approach. We assume that the full theory is perturbatively renormalizable and that nonrenormalizable interactions respect the symmetries of the standard model. We consider only those contributions generated at the lowest level in the perturbative full theory. It is found that the effects coming from new physics may enhance the standard model predictions for the number of events expected in the final states <(b)over bar b>, WW and ZZ up to one order of magnitude,whereas the corresponding number of events for the <(t)over bar t> final state may be enhanced up to two orders of magnitude. On the other hand, the new physics does not affect the relevant backgrounds.