The Mainz high-precision proton form factor measurement

An extensive measurement of the elastic H(e, e')p reaction in the Q2-region from 0.003 to 1 (GeV/c)2 has been performed with the 3-spectrometer-setup of the A1 collaboration at the Mainz Microtron. The dataset consists of about 3000 overlapping cross section measurements with a high level of internal redundancy. The large number of precisely measured cross sections allow for a determination of the electric and magnetic form factors with strict control over statistical and systematic errors, in particular also of the charge and magnetization radii of the proton. Besides the classical Rosenbluth separation, the form factors are separated by direct, global fits of different sufficiently flexible models.