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Both light-front wavefunctions and covariant Bethe--Salpeter amplitudes allow us to calculate a wide range of physical observables; however, neither the light-front wavefunctions nor the Bethe--Salpeter amplitudes themselves are physical observables, and can therefore not be measured directly. On the other hand, both can be (and have been) used to evaluate e.g. meson elastic and transition form factors, though the range in Q^2 over which one can unambiguously evalute such form factors without further assumptions generally differs between light-front approaches and the Bethe--Salpeter aproach based on a Euclidean formulation. I will present recent results for meson light-front wavefunctions, as well as physical observables such as elastic and transition form factors, obtained in the Basis Light-Front Quantization approach. I will also discuss explicitly covariant calculations of meson elastic and transition form factors based on a Euclidean formulation of the Dyson--Schwinger equations, and highlight the (dis)advantages of each of these two approach. Finally, I will indicate how one can in principle obtain the light-front wavefunction from the Bethe--Salpeter amplitudes using the Nakanishi integral representation, and what bottlenecks one might encounter in practice.
Webinar at https://meet.jit.si/ILCACseminar