https://doi.org/10.1051/epjconf/20159004001
Determination of αs at NLO*+NNLL from a global fit of the low-z parton-tohadron fragmentation functions in e+e− and DIS collisions
1 Sorbonne Université, UPMC Univ Paris 06, UMR 7589, LPTHE, F-75005, Paris, France
2 CNRS, UMR 7589, LPTHE, UPMC Univ. Paris 06, BP 126, 4 place Jussieu, F-75252 Paris Cedex 05, France
3 Department of Physics, P.O. Box 35, FI-40014 University of Jyväskylä, Jyväskylä, Finland
4 CERN, PH Department, CH-1211 Geneva 23, Switzerland
a e-mail: perez@lpthe.jussieu.fr
b e-mail: dde@cern.ch
Published online: 24 March 2015
The QCD coupling αs is determined from a combined analysis of experimental e+e− and e±p jet data confronted to theoretical predictions of the energy evolution of the parton-to-hadron fragmentation functions (FFs) moments –multiplicity, peak, width, skewness– at low fractional hadron momentum z. The impact of approximate next-to-leading order (NLO*) corrections plus next-to-next-to-leading log (NNLL) resummations, compared to previous LO+NLL calculations, is discussed. A global fit of the full set of existing data, amounting to 360 FF moments at collision energies √s ≈ 1–200 GeV, results in αs(mZ2) = 0.1189−0.0014+0.0025 at the Z mass.
© Owned by the authors, published by EDP Sciences, 2015
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
