An analysis of systematic effects in finite size scaling studies using the gradient flow

Abstract

We propose a new strategy for the determination of the step scaling function $\sigma (u)$ in finite size scaling studies using the Gradient Flow. In this approach the determination of $\sigma (u)$ is broken in two pieces: a change of the flow time at fixed physical size, and a change of the size of the system at fixed flow time. Using both perturbative arguments and a set of simulations in the pure gauge theory we show that this approach leads to a better control over the continuum extrapolations. Following this new proposal we determine the running coupling at high energies in the pure gauge theory and re-examine the determination of the $\Lambda$-parameter, with special care on the perturbative truncation uncertainties.

arXiv comment27 pages, 15 figures. Extended discussion on continuum extrapolation of step scaling function. Results unchanged

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