Uncertainties on the determination of the strong coupling alphaₛ from the energy evolution of jet fragmentation functions at low z
d'Enterria, David · Pérez-Ramos, Redamy
Original · EN
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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