arXiv:1401.3004·v1·High Energy Physics — Phenomenology
Three-loop matching of the vector current
Peter Marquard🇩🇪 · Jan H. Piclum🇩🇪 · Dirk Seidel🇩🇪 · Matthias Steinhauser🇩🇪
Abstract
We evaluate the three-loop corrections to the matching coefficient of the vector current between Quantum Chromodynamics (QCD) and non-relativistic QCD. The result is presented in the MSbar scheme where large perturbative corrections are observed. The implications on the threshold production of top quark pairs are briefly discussed.
Comments: 6 pages, 3 figures