We discuss the problem of lattice artefacts in QCD simulations enhanced by the introduction of dynamical charmed quarks. In particular, we advocate the use of a massive renormalization scheme with a close to realistic charm mass. To maintain O(a) improvement for Wilson type fermions in this case we define a finite size scheme and carry out a nonperturbative estimation of the clover coefficient csw. It is summarized in a fit formula csw(g02) that defines an improved action suitable for future dynamical charm simulations.
@article{arxiv.1805.01661,
title = {Symanzik Improvement with Dynamical Charm: A 3+1 Scheme for Wilson Quarks},
author = {Patrick Fritzsch and Rainer Sommer and Felix Stollenwerk and Ulli Wolff},
journal= {arXiv preprint arXiv:1805.01661},
year = {2018}
}
Comments
17 pages, 3 tables, 2 figures, published version (extended introduction)