Symanzik improvement with dynamical charm: a 3+1 scheme for Wilson quarks

Abstract

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.[Figure not available: see fulltext.].