We propose an operator product expansion for planar form factors of local operators in $\mathcal{N}=4$ SYM theory. This is based on the dual conformal symmetry these objects or, equivalently, their description terms periodic Wilson loops. A factor decomposed into a sequence known pentagon transitions and new universal object that we call "form transition". transition subject to set non-trivial ...

The deuteron form factors are calculated in the framework of the relativistic nucleon-meson dynamics. The relativistic effects change considerably the Sand D-waves of the deuteron, result in the dominating extra component in the deuteron wave function and generate the contact interaction between the nucleon, mesons and photon. The prediction for the polarization observable t20 is in good agreem...

Noticing that the " point-form " approach referred to in many recent works implies physics described on hyperplanes, an approach inspired from Dirac's one, which involves a hyperboloid surface, is presented. A few features pertinent to this new approach are emphasized. Consequences as for the calculation of form factors are discussed.