The strong coupling constant at large distances
High Energy Physics - Phenomenology
2009-08-24 v2
Abstract
In this paper we discuss effective strong coupling constants. Those are well behaved in the low-Q^2 domain, contrarily to alpha_s from pQCD. We present an extraction of an effective strong coupling constant from Jefferson Lab polarized data at intermediate and low Q^2. We also show how these data, together with spin sum rules, allow us to obtain the effective coupling constant over the entire Q^2 range. We then discuss the relation between the experimentally extracted coupling constant and theoretical calculations at low Q^2. We conclude on the importance of such study for the application of the AdS/CFT correspondence to QCD.
Cite
@article{arxiv.0901.2190,
title = {The strong coupling constant at large distances},
author = {A. Deur},
journal= {arXiv preprint arXiv:0901.2190},
year = {2009}
}
Comments
Proceedings for Spin2008 symposium. v2: added 2 referecences re. infrared fixed point