Abstract
The moments of the single inclusive momentum distribution of hadrons in QCD jets, are studied in the next-to-modified-leading-log approximation (NMLLA) including next-to-leading-order (NLO) corrections to the αs strong coupling. The evolution equations are solved using a distorted Gaussian parametrisation, which successfully reproduces the spectrum of charged hadrons of jets measured in e + e − collisions. The energy dependencies of the maximum peak, multiplicity, width, kurtosis and skewness of the jet hadron distribution are computed analytically. Comparisons of all the existing jet data measured in e + e − collisions in the range \( \sqrt{\mathrm{s}}\approx 2-200 \) GeV to the NMLLA + NLO* predictions allow one to extract a value of the QCD parameter ΛQCD , and associated two-loop coupling constant at the Z resonance α s(m 2Z ) = 0.1195 ± 0.0022, in excellent numerical agreement with the current world average obtained using other methods.
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Pérez-Ramos, R., d’Enterria, D. Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections. J. High Energ. Phys. 2014, 68 (2014). https://doi.org/10.1007/JHEP08(2014)068
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DOI: https://doi.org/10.1007/JHEP08(2014)068