Complete $O(α_s^4)$ QCD Corrections to Hadronic Z Decaysстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Corrections of order $α_s^4$ for the axial singlet contributions for the decay rate of the Z boson into hadrons are evaluated in the limit of the heavy top quark mass. Combined with recently finished $O(α_s^4)$ calculations of the nonsinglet corrections, the new results directly lead us to the first complete $O(α_s^4)$ prediction for the total hadronic decay rate of the Z boson. The new $O(α_s^4)$ term in Z-decay rate leads to a significant stabilization of the perturbative series, to a reduction of the theory uncertainty in the strong coupling constant αs, as extracted from these measurements, and to a small shift of the central value.