Uncertainties on the determination of the strong coupling alphas from the energy evolution of jet fragmentation functions at low z
Abstract
The QCD coupling alphas is determined at NLO*+NMLLA accuracy from the comparison of experimental jet data to theoretical predictions of the energy-evolution of the parton-to-hadron fragmentation function moments (multiplicity, peak, width, skewness) at low fractional hadron momentum z. From the existing e+e- and e-p jet data, we obtain alphas(mZ2) = 0.1195 +/- 0.0021 (exp.) +0.0015-0.0 (scale) at the Z mass. The uncertainties of the extracted alphas value are discussed.
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