Gradient Flow Coupling in the SU(2) gauge theory with two adjoint fermions

Abstract

We study SU(2) gauge theory with two fermion flavors in the adjoint representation. Using a clover improved HEX smeared action and the gradient flow running coupling allows us to simulate with larger lattice size than before. We find an infrared fixed point after a continuum extrapolation in the range $4.5\lesssim g^{\ast 2}\lesssim 5$. We also measure the mass anomalous dimension and find the value $0.25\lesssim {\gamma }^{\ast }\lesssim 0.28$ at the fixed point.

Comments: 6 pages, 4 figures. Additional information on simulation parameters and statistics. arXiv admin note: text overlap with arXiv:1510.03335