EPJ Web of Conferences
Volume 90, 2015XLIV International Symposium on Multiparticle Dynamics (ISMD 2014)
|Number of page(s)||9|
|Section||Hadronic final states in high pT collisions|
|Published online||24 March 2015|
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
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.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.