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High precision determination of $\alpha_s$ from a global fit of jet rates

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arxiv 1902.08158 v1 pith:QJXQCWPD submitted 2019-02-21 hep-ph

classification hep-ph
keywords alphadeterminationhighpredictionsratesuncertaintyaccountaccuracy
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abstract

We present state-of-the-art extractions of the strong coupling based on N$^3$LO+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 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 $\alpha_s(M_Z) = 0.11881 \pm 0.00063(exp.) \pm 0.00101(hadr.) \pm 0.00045(ren.) \pm 0.00034(res.)$, which is in agreement with the latest world average and has a comparable total uncertainty.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Exploring soft anomalous dimensions for $1/Q$ power corrections

    hep-ph 2024-11 conditional novelty 8.0 of 10

    The leading logarithmic correction to the 1/Q power correction for thrust and C-parameter is computed, with a sizeable coefficient S1 ≈ 2.455 and a universal C-to-thrust ratio of 3π/2.

  2. Role of higher twist effects in diffractive DIS and determination of diffractive parton distribution functions

    hep-ph 2019-08 conditional novelty 4.0 of 10

    A next-to-leading order fit to HERA diffractive DIS data that includes a fitted 1/Q^2 higher-twist term improves chi2/dof from 1.052 to 1.013 and changes the extracted gluon density, though the effect is not shown to ...

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