Exact analytic two-loop expressions for some QCD observables in the time-like region
High Energy Physics - Phenomenology
2007-05-23 v2
Abstract
The author of this work have got explicit expressions for the timelike region at Next-to-Leading-Order (NLO) as for the coupling function so for QCD observables. These expressions were compared with approximate ones obtained in terms of "double logarithms". Next-Next-to-Leading-Order (NNLO) Pade approximation was also discussed. In this paper some particular role of NLO was emphasised. It is related with the possibility to express any multi-loop expressions in terms of the two-loop ones. Thus we can use NLO functions as a basis of some functional expansion, where higher loop terms incorporation affects the expansion coefficients only.
Cite
@article{arxiv.hep-ph/0010072,
title = {Exact analytic two-loop expressions for some QCD observables in the time-like region},
author = {Dmitri S. Kourashev},
journal= {arXiv preprint arXiv:hep-ph/0010072},
year = {2007}
}
Comments
8 pages