Diphoton Generalized Distribution Amplitudes

TL;DR

This paper calculates the leading order diphoton generalized distribution amplitude for the process gamma* gamma -> gamma gamma, revealing its ln Q^2 behavior and evolution equations, which are relevant for understanding photon interactions at high energies.

Contribution

It introduces the calculation of the diphoton generalized distribution amplitude at leading order, including its evolution and characteristic logarithmic behavior.

Findings

Exhibits ln Q^2 dependence similar to photon structure functions.

Derives inhomogeneous evolution equations for the distribution amplitude.

Provides a theoretical framework for photon-photon interactions at high energies.

Abstract

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.