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We present preliminary results for the light harden spectrum in $N_f=2+1$lattice QCD obtained with the nonperturbatively $O(a)$-improved Wilson quarkaction and the Iwasaki gauge action. Simulations are carried out at$\beta=1.90$ on a $32^3 \times 64$ lattice using the PACS-CS computer. Weemploy L\"uscher's domain-decomposed HMC algorithm to reduce the up-down quarkmasses toward the physical value. The pseudoscalar meson masses range from 730MeV down to 210 MeV. We compare the light harden spectrum extrapolated to thephysical point with the experimental values.

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