Probing Anomalous Top Quark Couplings At eγ Colliders

We study in the effective Lagrangian approach the possibility of probing anomalous top quark charged current couplings in the single top production at a high energy eγ collider. We analyzed all possible dimension-six CP-conserving operators which can give rise to an anomalous Wtb coupling which represent new physics effect generated at a higher energy scale. For those operators which also give rise to anomalous Zbb̄ or right-handed Wtb couplings, we find that they are strongly constrained by the existing Rb and b → sγ data. As a result, a high luminosity is required in order to observe the anomalous effects. For other operators which currently subject to no strong constraints, the high energy eγ collider can probe their couplings effectively because of the clean environment of such a collider. To constrain the top quark physics through physics in the b-quark sector may provide a test of the effective Lagrangian approach to new physics.