$\ensuremath{\gamma}*\ensuremath{\gamma}*\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}$ form factor from anti--de Sitter-space/QCD correspondence

$γ * γ * \to π^{0}$ form factor from anti–de Sitter-space/QCD correspondence

Alexander Stoffers and Ismail Zahed

Phys. Rev. C 84, 025202 – Published 18 August 2011

Abstract

The recently measured $γ * γ * \to π^{0}$ anomalous form factor is analyzed using the $D 4 / D 8 \bar{D 8}$ holographic approach to QCD. The half-on-shell transition form factor is vector meson dominated and is shown to exactly tie to the charged-pion form factor. The holographic result compares well with the data for the lowest vector resonance.