Virtual Compton scattering at low energies with a positron beam

The Virtual Compton scattering (VCS) process at low energies explores the electromagnetic structure of proton in terms generalized polarizabilities (GPs). In one-photon exchange approximation, VCS can be accessed with exclusive photon production reactions electron or positron beams. extraction GPs from beam has seen substantial progress over past two decades. Nonetheless, a consistent picture to higher scales demands further investigations. Complementary measurements beams offer an unique possibility, and we present impact study such experimental program.