We calculate the leading order diphoton generalized distribution amplitudes by calculating the amplitude of the process ${\gamma }^{*}\gamma \to \gamma \gamma$ in the low energy and high photon virtuality region at the Born order and in the leading logarithmic approximation. As in the case of the anomalous photon structure functions, the $\gamma \gamma$ generalized distribution amplitudes exhibit a characteristic $\ln Q^2$ behavior and obey inhomogeneous QCD evolution equations.

• Received 6 June 2008

DOI:https://doi.org/10.1103/PhysRevD.78.034009