Five-Loop Running of the QCD coupling constant
| Autor: | Baikov, P. A., Chetyrkin, K. G., Kühn, J. H. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 118, 082002 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.118.082002 |
| 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: | arXiv |
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