Extraction of alpha_s from the energy evolution of jet fragmentation functions at low z
High Energy Physics - Phenomenology
2014-08-14 v1 High Energy Physics - Experiment
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.
Keywords
Cite
@article{arxiv.1408.2865,
title = {Extraction of alpha_s from the energy evolution of jet fragmentation functions at low z},
author = {David d'Enterria and and Redamy Perez-Ramos},
journal= {arXiv preprint arXiv:1408.2865},
year = {2014}
}
Comments
4 pages, 2 figures. Proceedings Moriond-QCD'2014