TH-PHD-2017-005

The proton electromagnetic form factors (FF) in the space-like region (q2 < 0) have
been measured for multiple decades using electron{proton scattering and Rosenbluth separation
method. Recently developed polarization transfer technique resulted in a dierent
value of extracted FF. It was suggested that the previously unaccounted hard two-photon
exchange (TPE) eect, can be responsible for the discrepancy. The OLYMPUS experiment
performed a high precision measurement of the TPE contribution via measurement
of the positron to electron elastic scattering cross section ratio. It was performed
at DESY using 2 GeV electron and positron beams and the BLAST spectrometer. A crucial part
of the experiment was precise measurement of the integrated luminosity. The symmetric
Moeller/Bhabha luminosity monitors, which were designed and built in Mainz, used Mller
and Bhabha processes for luminosity measurements. The analysis of the collected SYMB
data is presented in this work.

In the time-like region, where q2 > 0, form factor data is scarce and only the ratio of
electric to magnetic form factor have been measured so far. The PANDA experiment will
be able to measure individual electric and magnetic time-like FF. Extensive feasibility
studies of the proton form factor measurement have been performed using PandaRoot
simulation framework. This include the signal pbar p -> e+e- selection, the main background
pbar p -> pi+ pi- suppression, and investigation of possible sources of systematic uncertainties
in the q2 range between 5.4 GeV^2 and 13.9 GeV^2. The estimated statistical and systematic
accuracy of the proton FF extraction at PANDA is 2%-57%.