Pion–nucleon scattering: from chiral perturbation theory to Roy–Steiner equations Bastian Kubis, Martin Hoferichter, Jacobo Ruiz de Elvira and Ulf-G. Meißner EPJ Web Conf., 130 (2016) 01006 Published online: 29 November 2016 DOI: 10.1051/epjconf/201613001006