Volume 365 -
alphas-2019: Workshop on precision measurements of the QCD coupling constant
(ALPHAS2019) -
$a_S$ from $e^+e^-$ hadronic and tau pair final states
$a_S$ from soft QCD jet fragmentation functions
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Pre-published on:
July 22, 2019
Published on:
September 13, 2019
Abstract
We present an extraction of the QCD coupling $αs$ from the energy evolution of the first two moments (multiplicity and peak position) of the parton-to-hadron fragmentation functions at low fractional hadron momentum $z$. A fit of the experimental jet data, from $e+e−$ and deep-inelastice $±,ν-p$ collisions, to NNLO∗+NNLL predictions yields $αs$ $(mZ)= 0.1205±0.0010 (exp)$ + $0.0022−0.0000$ $(th)$, in good agreement with the current $αs$ world-average value.
DOI: https://doi.org/10.22323/1.365.0005
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.