Electromagnetic form factor via Minkowski and Euclidean Bethe-Salpeter amplitudes

摘要

The electromagnetic form factors (FF’s) calculated through the Euclidean Bethe-Salpeter (BS) amplitude and through the light-front (LF) wave function are compared with the one found using the BS amplitude in Minkowski space. The FF expressed through the Euclidean BS amplitude (both within and without static approximation) considerably differs from the Minkowski one, whereas the FF found in the LF approach is almost indistinguishable from it.