CREx Vector Analyzing Power Measurements

In elastic electron nucleus scattering where the electron's polarization is perpendicular to its momentum, a vector analyzing power is proportional to the imaginary component of the two photon exchange process. The analyzing power was measured for 40Ca, 48Ca, 208Pb, and 12C using a 2.2 GeV electron probe. Calcium provides a useful insight into intermediate nuclei to fill the gap in experimental data between Aluminum and Lead. An updated discussion of uncertainties and results will be shown.