A nonperturbative determination of the O(a) improvement coefficient c_A and the scaling of f_pi and m^{MSbar}

Abstract

We report on an investigation of the LANL method for determining the O(a) improvement coefficient c_A nonperturbatively. We find we are able to extract reliable estimates for the coefficient using this method. However, our study of systematic errors shows that for very accurate determinations of c_A, the smearing function must be tuned and the volume fixed to keep the O(a) ambiguity in c_A fixed as beta varies. Consistency was found with previous results from the LANL group and (within fairly large errors) 1-loop perturbation theory; c_A does not change significantly over the range beta=5.93-6.2. The big difference between our results and those of the ALPHA collaboration, around beta=6.0, show that the O(a) differences in c_A between the different methods can be large. We find that the lattice spacing dependence of f_pi and the renormalised quark mass is much smaller using our values of the coefficient compared to those of the ALPHA collaboration.

arXiv comment19 pages revtex, 13 tables, 15 figures

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Cited by in corpus (6)

• The decay constant of the first excited pion from lattice QCD
• Master-field simulations of O(a)-improved lattice QCD: Algorithms, stability and exactness
• Non-perturbative improvement of the axial current with three dynamical flavors and the Iwasaki gauge action
• Scaling behavior of discretization errors in renormalization and improvement constants
• Exploring two non-perturbative definitions of $c_A$
• The effect of sea quarks on the mass of the charm quark from Lattice QCD