Five-Loop Running of the QCD coupling constant
| Autor: | P.A. Baikov, Jens H. Kuhn, K.G. Chetyrkin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Quantum chromodynamics
Physics Coupling constant Particle physics 010308 nuclear & particles physics High Energy Physics::Lattice High Energy Physics::Phenomenology General Physics and Astronomy Order (ring theory) FOS: Physical sciences 01 natural sciences Standard Model Gluon High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Higgs boson Beta function (physics) High Energy Physics::Experiment Perturbation theory (quantum mechanics) 010306 general physics |
| Popis: | We analytically compute the five-loop term in the beta function which governs the running of $\alpha_s$ --- the quark-gluon coupling constant in QCD. The new term leads to a reduction of the theory uncertainty in $\alpha_s$ taken at the Z-boson scale as extracted from the $\tau$-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. Comment: 4 pages, numerical errors in eq. (13) and the next one are corrected; a citation is added |
| Databáze: | OpenAIRE |
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