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We propose an extension of the hard-wall AdS/QCD model by including theChern-Simons term required to reproduce the chiral anomaly of QCD. In theframework of this holographic model, we study the vertex function F_{\pi\gamma^* \gamma^*}(Q_1^2,Q_2^2) which accumulates information about thecoupling of the pion to two (in general virtual) photons. We calculate theslope of the form factor with one real and one slightly virtual photon and showthat it is close to experimental findings. We analyze the formal limit of largevirtualities and establish that predictions of the holographic modelanalytically (including nontrivial dependence on the ratio of photonvirtualities) coincide with those of perturbative QCD with asymptotic piondistribution amplitude. We also investigate the generalized VMD structure ofF_{\pi \gamma^* \gamma^*}(Q_1^2,Q_2^2) in the extended AdS/QCD model.

Anomalous Form Factor of the Neutral Pion in Extended AdS/QCD Model with Chern-Simons Term