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I investigate an SU(3) gauge model with 12 fundamental fermions. Thephysically interesting region of this strongly coupled system can be influencedby an ultraviolet fixed point due to lattice artifacts. I suggest to use agauge action with an additional negative adjoint plaquette term that lessensthis problem. I also introduce a new analysis method for the 2-lattice matchingMonte Carlo renormalization group technique that significantly reduces finitevolume effects. The combination of these two improvements allows me to measurethe bare step scaling function in a region of the gauge coupling where it isclearly negative, indicating a positive renormalization group $\beta$ functionand infrared conformality.

Infrared fixed point of the 12-fermion SU(3) gauge model based on 2-lattice MCRG matching