Low-Q^2 proton form factor program in Mainz*

The proton radius puzzle, the many-sigma difference in the extracted values from scattering and electric hydrogen spectroscopy on one side and muonic spectroscopy on the other, is one of the most striking puzzles in physics today. In electron scattering experiments, the radius can be deduced from the slope of the electric form factor at $Q^2$=0, and the precise knowledge of the form factor evolution at small $Q^2$ is paramount for an accurate extraction. In the talk, I will describe the current state-of-the-art experiments and the future plans for measurements at the Mainz facilities MAMI and MESA and briefly discuss the challenges for next generation measurements