Hadronic form factors violate QCD dispersion relations due to incomplete time-like spectral data above the last known resonance, which radial Regge trajectories can fill as a minimal ansatz, shown for the pion form factor.
Sanchez-Puertas and E
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Hadronic form factors in QCD and the incompleteness problem in the time-like region
Hadronic form factors violate QCD dispersion relations due to incomplete time-like spectral data above the last known resonance, which radial Regge trajectories can fill as a minimal ansatz, shown for the pion form factor.