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We use lattice simulations to study SU(3) gauge theory with 13 masslessfermions in the fundamental representation. We present evidence that the theoryis conformal with a non-zero infrared fixed point in the gauge coupling. We usea newly-developed technique to calculate the mass anomalous dimension at thefixed point via step-scaling of the mode number, allowing us to take thecontinuum limit and compare to perturbative predictions. We comment on therelevance of these findings to the extended search for the conformal window inthe fundamental representation and in particular 12 massless flavors.

Is SU(3) gauge theory with 13 massless flavors conformal?