2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/195907We extend the Fermilab method for heavy quarks to include all interactions of dimension six in the action. We discuss a subtlety in the power counting, which implies that, for heavy quarks, certain interactions of dimension seven are commensurate with some of those of dimension six. We then present tree-level matching conditions obtained from calculating the Compton scattering amplitude for (lattice) QCD. When the matching conditions have been applied, the improved action removes (tree-level) discretization errors of order $a^2\bm{p}^3/m_Q$ and $a^3\bm{p}^3$.1+5 pp., contribution to Lattice 2006(Quark Masses, Gauge Couplings, and Renormalization)High Energy Physics - Latticetext