Photocouplings at the pole from pion photoproductionD. Rönchen, M. Döring, F. Huang, H. Haberzettl, J. Haidenbauer, C. Hanhart, S. Krewald, U. -G. Meißner and K. NakayamaEur. Phys. J. A, 50 6 (2014) 101DOI: https://doi.org/10.1140/epja/i2014-14101-3