A. Deur
Published 2009-01-15, updated 2009-01-16Version 2
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.
Comments: Proceedings for Spin2008 symposium. v2: added 2 referecences re. infrared fixed point
Journal: AIP Conf.Proc.1149:281-284,2009
Experimental determination of the effective strong coupling constant
The AdS/CFT Correspondence and Non-perturbative QCD
Determination of the effective strong coupling constant alpha_{s,g_1}(Q^2) from CLAS spin structure function data
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