Local-Duality QCD Sum Rules for Pseudoscalar-Meson Form Factors

We scrutinize recent findings on the charged-pion elastic form factor and the form factors entering in neutral-meson-to-photons transition amplitudes within the framework of QCD sum rules.Comment: 4 pages, 4 figures, contributed to "QCD@Work 2012 - International Workshop on Quantum Chromodynamics: Theory and Experiment" (18 - 21 June 2012, Lecce, Italy), to appear in the proceeding

Pseudoscalar-Meson Form Factors: A Fresh Look by QCD Sum Rules

Confronted with some surprising claims about experimentally measured or theoretically expected dependencies on the involved momentum transfer of various form factors of pseudoscalar mesons, we reassess the present status of these quantities by means of QCD sum rules. This approach provides well-developed and very efficient tools to relate in an analytical manner the parameters of QCD to the empirical properties of hadrons. Within this framework, we show that a few theoretical findings for the pion elastic form factor and one experimental result for the pion-to-photon transition form factor are at odds with rather general fundamental considerations.Comment: 3 pages, 3 figures, contributed to "Quark Confinement and the Hadron Spectrum X" (8 - 12 October 2012, TUM Campus Garching, Munich, Germany), to appear in the proceeding

Meson-Photon Transition Form Factors

We present the results of our recent analysis of the meson-photon transition form factors $F_{P\gamma}(Q^2)$ for the pseudoscalar mesons $P = \pi^0,\eta,\eta',\eta_c$, using the local-duality version of QCD sum rules.Comment: 7 pages, 4 figures, talk presented at "QCD@Work 2012 - International Workshop on Quantum Chromodynamics: Theory and Experiment" (18 - 21 June 2012, Lecce, Italy), to appear in the proceeding