Z-boson hadronic decay width up to O(αs4)-order QCD corrections using the single-scale approach of the principle of maximum conformality.

In the paper, we study the properties of the Z-boson hadronic decay width by using the O (α s 4) -order quantum chromodynamics (QCD) corrections with the help of the principle of maximum conformality (PMC). By using the PMC single-scale approach, we obtain an accurate renormalization scale-and-scheme independent perturbative QCD (pQCD) correction for the Z-boson hadronic decay width, which is independent to any choice of renormalization scale. After applying the PMC, a more convergent pQCD series has been obtained; and the contributions from the unknown O (α s 5) -order terms are highly suppressed, e.g. conservatively, we have Δ Γ Z had | PMC O (α s 5) ≃ ± 0.004 MeV. In combination with the known electro-weak (EW) corrections, QED corrections, EW–QCD mixed corrections, and QED–QCD mixed corrections, our final prediction of the hadronic Z decay width is Γ Z had = 1744. 439 - 1.433 + 1.390 MeV, which agrees with the PDG global fit of experimental measurements, 1744.4 ± 2.0 MeV. [ABSTRACT FROM AUTHOR]