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We report on a recent study of the ground-state octet baryon masses using thecovariant baryon chiral perturbation theory with the extended-on-mass-shellrenormalization scheme up to next-to-next-to-next-to-leading order. Byadjusting the available 19 low-energy constants, a good fit of the $n_f=2+1$lattice quantum chromodynamics results from the PACS-CS, LHPC, HSC, QCDSF-UKQCDand NPLQCD collaborations is achieved.

Quark mass dependence of the ground-state octet baryons in next-to-next-to-next-to-leading order covariant baryon chiral perturbation theory