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

Verbytskyi, Andrii, Banfi, Andrea, Kardos, Adam, Francesco Monni, Pier, Kluth, Stefan, Somogyi, Gábor, Szőr, Zoltán, Trócsányi, Zoltán, Tulipant, Zoltán and Zanderighi, Giulia (2019) High precision determination of αs from a global fit of jet rates. Journal of High Energy Physics, 2019 (8). a129 1-31. ISSN 1126-6708

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Amelia Redman
Date Deposited: 30 Sep 2019 10:45
Last Modified: 30 Sep 2019 10:55
URI: http://sro.sussex.ac.uk/id/eprint/86330

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