The strong coupling constant at large distances

Details The strong coupling constant at large distances The strong coupling constant at large distances

2009-01-15

arxiv.org/abs/0901.2190v2

AIP Conf.Proc.1149:281-284,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proceedings for Spin2008 symposium. v2: added 2 referecences re. infrared fixed point

Scientific paper

10.1063/1.3215646

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.

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