Regular Article – Theoretical Physics
Z-boson hadronic decay width up to -order QCD corrections using the single-scale approach of the principle of maximum conformality
Department of Physics, Chongqing University, 401331, Chongqing, People’s Republic of China
2 Department of Physics, Guizhou Minzu University, 550025, Guiyang, People’s Republic of China
3 School of Physics and Electronics, Hunan University, 410082, Changsha, People’s Republic of China
Accepted: 30 March 2021
Published online: 7 April 2021
In the paper, we study the properties of the Z-boson hadronic decay width by using the -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 -order terms are highly suppressed, e.g. conservatively, we have 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 MeV, which agrees with the PDG global fit of experimental measurements, MeV.
© The Author(s) 2021
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