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We investigate three-nucleon forces (3NF) from lattice QCD simulations,utilizing the Nambu-Bethe-Salpeter (NBS) wave function to determine two-nucleonforces (2NF) and 3NF on the same footing. Quantum numbers of the three-nucleon(3N) system are chosen to be (I, J^P)=(1/2, 1/2^+) (the triton channel). Weconsider the simplest geometrical configuration where 3N are aligned linearlywith an equal spacing, to reduce the enormous computational cost. Lattice QCDsimulations are performed using Nf=2 dynamical clover fermion configurations atthe lattice spacing of a = 0.156 fm on a 16^3 x 32 lattice with a large quarkmass corresponding to m(\pi) = 1.13 GeV. We find repulsive 3NF at shortdistance.

The Lattice QCD Study of the Three-Nucleon Force