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Higgs-boson, tau-lepton, and Z-boson decay rates in fourth order and the five-loop β-function of QCDстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 сентября 2021 г.
- Авторы: Kühn J.H., Baikov P.A., Chetyrkin K.G.
- Журнал: Proceedings of Science
- Том: 365
- Год издания: 2019
- Издательство: Sissa Medialab
- Местоположение издательства: Italy
- Первая страница: 007
- Последняя страница: 012
- DOI: 10.22323/1.365.0007
- Аннотация: The Higgs-boson decay rates into bb and into gg have been evaluated in N4LO, corresponding to order α4s for bb and order α6s for gg final states. After inclusion of the four-loop term, nice stabilization of the series is observed. In a similar context the predictions for the τ− and the Z− decay rate, as well as the R− ratio measured in electron-positron annihilation are presented in order α4s. Similar methods are employed for the evaluation of the beta function which governs the running of the quark-gluon coupling in quantum chromodynamics. The five-loop term of this fundamental quantity has been evaluated and the result has quickly been confirmed and even extended to a general gauge group. This five-loop term leads to a further reduction of the theory uncertainty in αs, evaluated at the Z− boson or Higgs-boson scale, if originally extracted from τ− lepton decays and subsequently evolved to mZ or mZ.
- Добавил в систему: Байков Павел Анатольевич