  This work studies the experiments of two-photon processes at BESIII from a
theoretical viewpoint in light-cone quantum field theory. We adopt the momentum
space wave function of the pion in the light-cone formalism by two forms of the
Brodsky-Huang-Lepage~(BHL) prescription and the light-cone holographic QCD. We
find that the wave function got by the light-cone holographic QCD can be
related to the BHL wave function by a Jacobian factor. Then we calculate the
transition form factor~(TFF) of the two-photon process by these two wave
functions under the light-cone quark model. We compare the calculated results
with the preliminary experimental data at BESIII and also other theoretical
calculations.
