Extraction of alpha_s from the energy evolution of jet fragmentation functions at low z

Abstract

A novel method to extract the QCD coupling alpha_s from the energy evolution of the moments of the parton-to-hadron fragmentation functions at low fractional hadron momentum z, is presented. The evolution of the moments (multiplicity, peak, width, skewness) of the charged-hadron distribution in jets is computed at NMLLA+NLO* accuracy and compared to the experimental deep-inelastic e-p data. Values of the strong coupling constant at the Z pole are obtained, alpha_s(m_Z) = 0.119 +/- 0.010, in excellent numerical agreement with the current world average determined using other methods at the same level of accuracy.

arXiv comment4 pages, 2 figures. Proceedings Moriond-QCD'2014

Cited by in corpus (4)

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• Uncertainties on the determination of the strong coupling alpha_s from the energy evolution of jet fragmentation functions at low z
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• Three-dimensional Statistical Jet Fragmentation