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We study the evolution of the coupling in SU(2) gauge field theory with$N_f=4$, 6 and 10 fundamental fermion flavours on the lattice. These values arechosen close to the expected edges of the conformal window, where the theorypossesses an infrared fixed point. We use improved Wilson-clover action, andmeasure the coupling in the Schr\"odinger functional scheme. At four flavourswe observe that the couping grows towards the infrared, implying QCD-likebehaviour, whereas at ten flavours the results are compatible with a Banks-Zakstype infrared fixed point. The six flavour case remains inconclusive: theevolution of the coupling is seen to become slower at the infrared, but theaccuracy of the results falls short from fully resolving the fate of thecoupling. We also measure the mass anomalous dimension for the $N_f=6$ case.

Determining the conformal window: SU(2) gauge theory with N_f = 4, 6 and 10 fermion flavours