Speaker
Description
Hadronic form factors are around since Hofstadter proved the finite proton size in 1955 in electron scattering experiments, identified as matrix elements of the em current. Since then, the nucleon and other hadronic form factors have been measured or computed in lattice QCD using all sorts of currents: electromagnetic, axial or gravitational. In the time-like region analyticity, chiral perturbation theory and perturbative QCD play a key role and imply a set of normalization and superconvergent sum rules which are rigorous conditions. We show several instances where these conditions are flagrantly violated due to a lack of information in the region above the largest known resonances and the below the onset of pQCD. We popose to use radial Regge trajectories to fill the gap and examine the consequences.