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

Understand

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.