Theoretical description and measurement of the pion-photon transition form factor

Abstract

Detailed predictions for the scaled pion-photon transition form factor are given, derived with the method of light-cone sum rules and using pion distribution amplitudes with two and three Gegenbauer coefficients obtained from QCD sum rules with nonlocal condensates. These predictions agree well with all experimental data that are compatible with QCD scaling (and collinear factorization), but disagree with the high-$Q^2$ data of the BaBar Collaboration that grow with the momentum. A good agreement of our predictions with results obtained from AdS/QCD models and Dyson-Schwinger computations is found.

10 pages, 4 figures, 6 references added, minor style corrections, Presented by the first author at the Light-Cone Conference 2013, May 20-24, 2013, Skiathos, Greece

References in corpus (8)

• Explanation and Prediction of Observables using Continuum Strong QCD
• Measurement of gamma gamma* --> pi0 transition form factor at Belle
• Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited
• Comparing antithetic trends of data for the pion-photon transition form factor
• A combined study of the pion's static properties and form factors
• Pion transition form factor in the constituent quark model
• Gluonic components of the pion and the transition form factor ${\gamma }^{\ast }{\gamma }^{\ast }\to {\pi }^0$
• QCD on the Light-Front -- A Systematic Approach to Hadron Physics

Cited by in corpus (4)

• Chimera distribution amplitudes for the pion and the longitudinally polarized $\rho$-meson
• On the pion distribution amplitude. Derivation, properties, predictions
• The longitudinal and transverse distributions of the pion wavefunction from the present experimental data on the pion-photon transition form factor
• Radial excitation of light mesons and the $\gamma {\gamma }^{\ast }\to {\pi }^0$ transition form factor