Speaker
Description
An overview of the form factor programme of the A1 Collaboration at MAMI is given. Results on the electromagnetic form factors of the proton measured with elastic electron scattering at four-momentum transfers Q2 between 0.003 and 1 GeV2/c2 are reported, which allow an extraction of the electric and magnetic radii and a determination of the two-photon exchange correction. The analysis of proton data taken at Q2 up to 2 GeV2/c2 as well as the analysis of deuteron data are ongoing. A novel technique to measure the electric form factor of the proton at very low Q2 using initial state radiation (ISR) is presented and first results from a pilot experiment are reported. Future plans at Mainz include an ISR measurement with a new gas jet target and a new experiment to measure the neutron electric form factor.
