Diphoton generalized distribution amplitudes
M. El Beiyad, B. Pire, L. Szymanowski, S. Wallon
2008
Physical Review D
We calculate the leading order diphoton generalized distribution amplitude by calculating the amplitude of the process gamma* gamma -> 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 amplitude exhibits a characteristic \ln Q^2 behaviour and obeys inhomogeneous evolution equations.
doi:10.1103/physrevd.78.034009
fatcat:xqf4v36jbnhvhgtmd2jkkx5vya