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Incorporated with twisted boundary condition, Polyakov loop correlators cangive a definition of the renormalized coupling. We employ this scheme for thestep scaling method (with step size s = 2) in the search of conformal fixedpoint of SU(3) gauge theory with 12 massless flavors. Staggered fermion andplaquette gauge action are used in the lattice simulation with six differentlattice sizes, L/a = 20, 16, 12, 10, 8 and 6. For the largest lattice size, L/a= 20, we used a large number of Graphics Processing Units (GPUs) andaccumulated 3,000,000 trajectories in total. We found that the step scalingfunction sigma (u) is consistent with u in the low-energy region. This meansthe existence of conformal fixed point. Some details of our analysis andsimulations will also be presented.

The Infrared behavior of SU(3) Nf=12 gauge theory -about the existence of conformal fixed point-