Abstracto
- The QCD evolution of the pion distribution amplitude (DA) φ∏(x, Q2 ) is computed for several commonly used models. Our analysis includes the nonperturbative form predicted by lightfront holographic QCD, thus combining the nonperturbative bound state dynamics of the pion with the perturbative ERBL evolution of the pion distribution amplitude. We calculate the meson-photon transition form factors for the ∏0 , η and η1 using the hard-scattering formalism. We point out that a widely-used approximation of replacing φ (x,(1 − x)Q) with φ(x, Q) in the calculations will unjustifiably reduce the predictions for the meson-photon transition form factors. It is found that the four models of the pion DA discussed give very different predictions for the Q2 dependence of the meson-photon transition form factors in the region of Q2 > 30 GeV2 . More accurate measurements of these transition form factors at the large Q2 region will be able to distinguish the four models of the pion DA. The rapid growth of the large Q2 data for the pion-photon transition form factor reported by the BABAR Collaboration is difficult to explain within the current framework of QCD. If the BABAR data for the meson-photon transition form factor for the π 0 is confirmed, it could indicate physics beyond-the-standard model, such as a weakly-coupled elementary C = + axial vector or pseudoscalar z0 in the few GeV domain, an elementary field which would provide the coupling γ ∗γ → z0 → ∏0 at leading twist. Our analysis thus indicates the importance of additional measurements of the pion-photon transition form factor at large Q2 .