Muon g-2, rare decays P \to l^+l^- and transition form factors P \to γγ^*

Abstract

Measuring the muon anomalous magnetic moment g-2 and the rare decays of light pseudoscalar mesons into lepton pair P \to l+l- serve as important test of the standard model. To reduce the theoretical uncertainty in the standard model predictions the data on the transition form factors of light pseudoscalar mesons play significant role. Recently new data on behavior of these form factors at large momentum transfer was supplied by the BABAR collaboration. We comment on the (in)consistency of these data with perturbative QCD expectation.

4 pages, 3 figures, invited talk at the 3rd Joint International Hadron Structure'09 Conference, Tatranska Strba (Slovak Republic), Aug. 30--Sept. 3, 2009; v2 - some typos are corrected

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Cited by in corpus (7)

• Pion transition form factor in the Regge approach and incomplete vector-meson dominance
• How the recent BABAR data for P to γγ* affect the Standard Model predictions for the rare decays P to l+l-
• The eta-photon transition form factor
• Model analysis of the world data on the pion transition form factor
• Gluonic components of the pion and the transition form factor ${\gamma }^{\ast }{\gamma }^{\ast }\to {\pi }^0$
• Pseudoscalar meson form factors and decays
• A model of a transition neutral pion formfactor measured in annihilation and scattering channels