Completely automated computation of the heavy-fermion corrections to the three-loop matching coefficient of the vector current

Details Completely automated computation of the heavy-fermion corrections to the three-loop matching coefficient of the vector current Completely automated computation of the heavy-fermion corrections to the three-loop matching coefficient of the vector current

2009-04-06

arxiv.org/abs/0904.0920v1

Phys.Lett.B678:269-275,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages

Scientific paper

10.1016/j.physletb.2009.05.070

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.

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