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We investigate the quark mass dependence of meson and baryon masses obtainedfrom 2+1 flavor dynamical quark simulations performed by the PACS-CSCollaboration. With the use of SU(2) and SU(3) chiral perturbation theories upto NLO, we examine the chiral behavior of the pseudoscalar meson masses and thedecay constants in terms of the degenerate up-down quark mass ranging form 3MeV to 24 MeV and two choices of the strange quark mass around the physicalvalue. We discuss the convergence of the SU(2) and SU(3) chiral expansions andpresent the results for the low energy constants. We find that the SU(3)expansion is not convergent at NLO for the physical strange quark mass. Thechiral behavior of the nucleon mass is also discussed based on the SU(2) heavybaryon chiral perturbation theory up to NNLO. Our results show that theexpansion is well behaved only up to m_pi^2 ~ 0.2 GeV^2.

SU(2) and SU(3) chiral perturbation theory analyses on meson and baryon masses in 2+1 flavor lattice QCD