Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10724065 | Physics Letters B | 2009 | 7 Pages |
Abstract
We evaluate the corrections to the matching coefficient of the vector current between Quantum Chromodynamics (QCD) and Non-Relativistic QCD (NRQCD) to three-loop order containing a closed heavy-fermion loop. The result constitutes a building block both for the bottom- and top-quark system at threshold. Strong emphasis is put on our completely automated approach of the calculation including the generation of the Feynman diagrams, the identification of the topologies, the reduction to master integrals and the automated numerical computation of the latter.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
P. Marquard, J.H. Piclum, D. Seidel, M. Steinhauser,