Abstract
We investigate the influence of new Jefferson Lab polarization-transfer ${(C}_{{x}^{\ensuremath{'}}}$ and ${C}_{{z}^{\ensuremath{'}}})$ and recoil polarization ${(P}_{y})$ measurements in multipole fits to the single-pion photoproduction database. Results are compared to those found with the addition of a double-polarization quantity associated with the Gerasimov--Drell-Hearn sum rule.
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