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We report our recent study of spin-orbit force between two nucleons in theparity-odd sector from lattice QCD. To examine the quark mass dependence ofspin-orbit force, we construct it from Nambu-Bethe-Salpeter wave functions in$^3P_0$, $^3P_1$ and $^3P_2-^3F_2$ channels calculated from lattice QCD in thequark mass region $m_\pi$=702-411 MeV. The calculation is performed on BlueGene/Q at KEK by using $N_f=2+1$ PACS-CS gauge configuration generated by O(a)improved Wilson quark action with RG improved (Iwasaki) gauge action. We findthat the potentials tend to become stronger as the quark mass decreases.

Quark mass dependence of Spin-Orbit force in parity-odd NN system from 2+1 flavor QCD