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T: Fachverband Teilchenphysik
T 13: QCD (Theorie) 3
T 13.4: Talk
Thursday, March 1, 2012, 17:30–17:45, VG 3.103
Simultaneous decoupling of bottom and charm quarks — Andrey Grozin1, Maik Höschele2, •Jens Hoff2, and Matthias Steinhauser2 — 1Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia — 2Institut für Theoretische Teilchenphysik, Karlsruher Institut für Technologie, D-76128 Karlsruhe, Germany
We compute the decoupling relations for the strong coupling, the light quark masses, the gauge-fixing parameter, and the light fields in QCD with heavy charm and bottom quarks to three-loop accuracy taking into account the exact dependence on mc/mb. The application of a low-energy theorem allows the extraction of the three-loop effective Higgs-gluon coupling valid for extensions of the Standard Model with additional heavy quarks from the decoupling constant of αs.