Abstract
The dark photon is a new gauge boson which arises from an extra U'(1) gauge symmetry. In this paper, a novel dark photon production mechanism based on MeV-scale gamma –gamma collider is considered: gamma gamma rightarrow gamma A'. With the aid of PACKAGE-X, differential cross section of gamma gamma rightarrow gamma A' is obtained, as a function of the kinetic mixing parameter varepsilon and dark photon mass m_{A'}. Taking the light-by-light scattering as background, the constraints on the dark photon parameter space for different time intervals in a MeV-scale gamma –gamma collider are also given.
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