Fermionic Corrections to the Three-Loop Matching Coefficient of the Vector Current

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dc.creatorMarquard, P.
dc.creatorPiclum, J. H.
dc.creatorSeidel, D.
dc.creatorSteinhauser, M.
dc.date2006-07-14
dc.date.accessioned2026-07-07T11:05:15Z
dc.date.available2026-07-07T11:05:15Z
dc.descriptionIn this paper we consider the matching coefficient of the vector current between Quantum Chromodynamics (QCD) and Non-Relativistic QCD (NRQCD) to three-loop order in perturbation theory. We evaluate the fermionic corrections containing a closed massless fermion loop. The results are building blocks both for the bottom and top quark system at threshold. We explain in detail the methods used for the evaluation of the Feynman diagrams, classify the occurring master integrals and provide results for the latter. The numerical effects are significant. They have the tendency to improve the behaviour of the perturbative series -- both for the bottom and top quark system.
dc.description21 pages
dc.identifierhttps://arxiv.org/abs/hep-ph/0607168
dc.identifierhttp://arxiv.org/abs/hep-ph/0607168
dc.identifierNucl.Phys.B758:144-160,2006
dc.identifierdoi:10.1016/j.nuclphysb.2006.09.015
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189149
dc.subjectHigh Energy Physics - Phenomenology
dc.titleFermionic Corrections to the Three-Loop Matching Coefficient of the Vector Current
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