Lowest-lying octet baryon masses in covariant baryon chiral perturbation theory

Abstract

We report on a systematic study of the ground-state octet baryon masses in the covariant baryon chiral perturbation theory with the extended-on-mass-shell renormalization scheme up to next-to-next-to-next-to-leading order, taking into account the contributions of the virtual decuplet baryons. A reasonable description of the lattice results is achieved by fitting simultaneously all the publicly available $n_f=2+1$ lattice QCD data. It confirms that the various lattice simulations are consistent with each other. We stress that a self-consistent treatment of finite-volume corrections is important to obtain a ${\chi }^2/d.o.f.$ about 1.

Comments: 4 pages, 1 table; presented by Xiu-Lei Ren at the 9th international workshop on the physics of excited nucleons (NSTAR2013), May 27-30, 2013, Peniscola, Spain