Speaker
Description
The elastic form factors of the proton and neutron are fundamental observables representing a projection of the internal structure of the nucleon. Measurements of the electromagnetic form factors of the proton and neutron can be combined to separately determine contributions from the $u$ and $d$ constituents of the nucleon, however, this interpretation relies on assumptions of both charge symmetry and negligible contributions from strangeness form factors. These assumptions are virtually untested at high momentum transfer, introducing a large uncertainty in flavor-separated form factors. The COIN proposal at Jefferson Lab aims to measure parity-violation with coincidence detection of electron-proton elastic scattering at $Q^2 = 2.5~\mbox{GeV/c}^2$, to determine the weak form factor of the proton. This will provide a crucial check of these assumptions which will greatly improve the precision of the flavor-separated electromagnetic nucleon form factors.
