Nucleon mass and pion-nucleon sigma term from a chiral analysis of lattice QCD world data L. Alvarez-Ruso, T. Ledwig, J. Martin Camalich and M.J. Vicente Vacas EPJ Web of Conferences, 73 (2014) 04015 Published online: 09 June 2014 DOI: 10.1051/epjconf/20147304015