Searching for an anomalous t̄qγ coupling via single top quark production at a γγ collider

We investigate the potential of a high-energy γγ collider to detect an anomalous t̄qγ coupling from observation of the reaction γγ→tq̄, t̄q, where q=c or u. We find that with b-tagging and suitable kinematic cuts this process should be observable if the anomalous coupling κ/Λ is no less than about 0.05/TeV, where Λ is the scale of new physics associated with the anomalous interaction. This improves upon the bound possible from observation of top decays at the Tevatron.