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

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  • Published: 23 August 2019
  • Volume 2019, article number 129, (2019)
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High precision determination of αs from a global fit of jet rates
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  • Andrii Verbytskyi1,
  • Andrea Banfi2,
  • Adam Kardos3,
  • Pier Francesco Monni4,
  • Stefan Kluth1,
  • Gábor Somogyi5,
  • Zoltán Szőr6,
  • Zoltán Trócsányi5,7,
  • Zoltán Tulipánt5 &
  • …
  • Giulia Zanderighi1 

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A preprint version of the article is available at arXiv.

Abstract

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.

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Authors and Affiliations

  1. Max-Planck-Institut für Physik, D-80805, Munich, Germany

    Andrii Verbytskyi, Stefan Kluth & Giulia Zanderighi

  2. University of Sussex, Brighton, BN1 9RH, U.K.

    Andrea Banfi

  3. University of Debrecen, Box 105, Debrecen, PO, 4010, Hungary

    Adam Kardos

  4. CERN, Theory Department, CH-1211, Geneva 23, Switzerland

    Pier Francesco Monni

  5. MTA-DE Particle Physics Research Group, University of Debrecen, Box 105, Debrecen, PO, 4010, Hungary

    Gábor Somogyi, Zoltán Trócsányi & Zoltán Tulipánt

  6. PRISMA Cluster of Excellence, Institut für Physik, Universität Mainz, D-55099, Mainz, Germany

    Zoltán Szőr

  7. Institute for Theoretical Physics, Eötvös Loránd University, Pázmány Péter 1/A, Budapest, H-1117, Hungary

    Zoltán Trócsányi

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  1. Andrii Verbytskyi
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Correspondence to Andrii Verbytskyi.

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ArXiv ePrint: 1902.08158

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Verbytskyi, A., Banfi, A., Kardos, A. et al. High precision determination of αs from a global fit of jet rates. J. High Energ. Phys. 2019, 129 (2019). https://doi.org/10.1007/JHEP08(2019)129

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  • Received: 07 March 2019

  • Revised: 11 June 2019

  • Accepted: 29 July 2019

  • Published: 23 August 2019

  • DOI: https://doi.org/10.1007/JHEP08(2019)129

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Keywords

  • Jets
  • QCD Phenomenology
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