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We present preliminary results for the light harden spectrum in N f = 2 + 1 lattice QCD using the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action. Simulations are carried out at β = 1.90 on a 32 3 × 64 lattice using the PACS-CS computer. We employ Luscher’s domain-decomposed HMC algorithm to reduce the up-down quark masses toward the physical value. The pseudoscalar meson masses range from 730 MeV down to 210 MeV. We compare the light harden spectrum extrapolated to the physical point with the experimental values.

Light hadron spectrum with 2+1 flavor dynamical O(a)-improved Wilson quarks