Five-Loop Running of the QCD Coupling Constant
2017; American Physical Society; Volume: 118; Issue: 8 Linguagem: Inglês
10.1103/physrevlett.118.082002
ISSN1092-0145
AutoresP.A. Baikov, K.G. Chetyrkin, J.H. Kühn,
Tópico(s)High-Energy Particle Collisions Research
ResumoWe analytically compute the five-loop term in the beta function which governs the running of α_{s}-the quark-gluon coupling constant in QCD. The new term leads to a reduction of the theory uncertainty in α_{s} taken at the Z-boson scale as extracted from the τ-lepton decays as well as to new, improved by one more order of perturbation theory, predictions for the effective coupling constants of the standard model Higgs boson to gluons and for its total decay rate to the quark-antiquark pairs.
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