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Simultaneous decoupling of bottom and charm quarks

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 $m_c/m_b$. 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 $α_s$.

preprint2011arXivOpen access
Andrey G. GrozinMaik HoescheleJens HoffMatthias Steinhauser
hep-ph
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Open access4 authors1 topic
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Andrey G. GrozinMaik HoescheleJens HoffMatthias Steinhauser

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