α_s determination at NNLO^⋆+NNLL accuracy from the energy evolution of jet fragmentation functions at low z

2015/05/11 by David d'Enterria, d'Enterria, David, and Redamy Pérez-Ramos +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #hep-ex #hep-ph

paper · pdf · doi:10.48550/arxiv.1505.02624

4 pages, 3 figures. Proceedings Rencontres Moriond "QCD and high energy interactions", March 2015, La Thuile. Typo corrected

arxiv created 2015/05/19 · arxiv updated 2015/05/20

Abstract

The QCD coupling α_s is extracted from the energy evolution of the first two moments (multiplicity and mean) of the parton-to-hadron fragmentation functions at low fractional hadron momentum z. Comparisons of the experimental e⁺e^- and deep-inelastic e^±p jet data to our NNLO^*+NNLL predictions, allow us to obtain α_s(m__{\rm Z}) = 0.1205±0.0010^+0.0022_-0.0000, in excellent agreement with the current world average determined using other methods at the same level of accuracy.

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