TA-DPG-2018-027

Within the FAIR phase-0 project, the use of FAIR equipment at
other facilities before the completion of the civil construction is envis-
aged. The PANDA EMC is a good candidate for FAIR phase-0, due
to the advanced state of its development. In particular, the backward
endcap (BWEC) of the PANDA EMC, which is developed and built at
HIM in Mainz, could be ready by 2020, three years before its foreseen
installation. Therefore, possible experiments at the MAMI electron
beam facility making use of the BWEC are under consideration.
One candidate is the measurement of the π electromagnetic transition
form factor via the electroproduction on a nuclear Coulomb field. To
select this channel, the momentum distribution of the π needs to be
measured by detecting the decay γ particles in an EMC.
Since the relevant γ s are emitted at forward angles, where high par-
ticle fluxes are expected, the affordable luminosity is limited by the
maximum event rate of the detector. Therefore, the total event rate at
different scattering angles with various targets need to be determined.
Monte Carlo simulations are ongoing and a beam test with a prototype
calorimeter was scheduled for January 2018 in order to address these
questions. The status of these feasibility studies will be presented.