Compton scattering from the proton in an effective field theory with explicit Delta degrees of freedom J. A. McGovern, D. R. Phillips and H. W. Grießhammer Eur. Phys. J. A, 49 1 (2013) 12 Published online: 23 January 2013 DOI: 10.1140/epja/i2013-13012-1