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We study the evolution of the coupling in SU(2) gauge field theory with$N_f=8$ fundamental fermion flavors on the lattice. This model is expected tohave an infrared fixed point at high coupling. We use HEX-smeared Wilson-cloveraction, and measure the gradient flow running coupling with Dirichlet boundaryconditions. Extrapolating our results to continuum, we find an infrared fixedpoint at $g^2=8.24(59)^{+0.97}_{-1.64}$, with statistical and systematic errorestimates. We also measure the anomalous dimension of the quark mass operator,and find its value at the fixed point $\gamma \approx 0.15 \pm 0.02$.

The gradient flow running coupling in SU(2) gauge theory with $N_f=8$ fundamental flavors