Baryon masses and nucleon sigma terms in manifestly Lorentz-invariant   baryon chiral perturbation theory
  We discuss the masses of the ground state baryon octet and the nucleon sigma terms in the framework of manifestly Lorentz-invariant baryon chiral perturbation theory. In order to obtain a consistent power counting for renormalized diagrams the extended on-mass-shell renormalization scheme is applied. 
B. C. Lehnhart, J. Gegelia, S. Scherer