Scaling dimensions in QED3 from the ∈-expansion

We study the fixed point that controls the IR dynamics of QED in d = 4 - 2 is an element of dimensions. We derive the scaling dimensions of four-fermion and bilinear operators beyond leading order in the is an element of-expansion. For the four-fermion operators, this requires the computation of a two-loop mixing that was not known before. We then extrapolate these scaling dimensions to d = 3 to estimate their value at the IR fixed point of QED(3) as function of the number of fermions N-f . The next-to-leading order result for the four-fermion operators corrects significantly the leading one. Our best estimate at this order indicates that they do not cross marginality for any value of N-f, which would imply that they cannot trigger a departure from the conformal phase. For the scaling dimensions of bilinear operators, we observe better convergence as we increase the order. In particular, the is an element of-expansion provides a convincing estimate for the dimension of the flavor-singlet scalar in the full range of N-f.