High precision determination of αs from a global fit of jet rates

Andrii Verbytskyi, Andrea Banfi, Adam Kardos, Pier Francesco Monni, Stefan Kluth, Gábor Somogyi, Zoltán Szőr, Z. Trócsányi, Zoltán Tulipánt, Giulia Zanderighi

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4 Citations (Scopus)


We present state-of-the-art extractions of the strong coupling based on N3LO+NNLL accurate predictions for the two-jet rate in the Durham clustering algorithm at e+e collisions, as well as a simultaneous fit of the two- and three-jet rates taking into account correlations between the two observables. The fits are performed on a large range of data sets collected at the LEP and PETRA colliders, with energies spanning from 35 GeV to 207 GeV. Owing to the high accuracy of the predictions used, the perturbative uncertainty is considerably smaller than that due to hadronization. Our best determination at the Z mass is αs (MZ) = 0.11881 ± 0.00063(exp.) ± 0.00101(hadr.) ± 0.00045(ren.) ± 0.00034(res.), which is in agreement with the latest world average and has a comparable total uncertainty.

Original languageEnglish
Article number129
JournalJournal of High Energy Physics
Issue number8
Publication statusPublished - Aug 1 2019


  • Jets
  • QCD Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Verbytskyi, A., Banfi, A., Kardos, A., Monni, P. F., Kluth, S., Somogyi, G., Szőr, Z., Trócsányi, Z., Tulipánt, Z., & Zanderighi, G. (2019). High precision determination of αs from a global fit of jet rates. Journal of High Energy Physics, 2019(8), [129]. https://doi.org/10.1007/JHEP08(2019)129