Effect of double-polarization data in fits to single-pion   photoproduction
  We investigate the influence of new Jefferson Lab polarization-transfer data, Cx and Cz, and recoil polarization, Py, 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. 
R.A. Arndt, I.I. Strakovsky and R.L. Workman