Experimental determination of the effective strong coupling constant

Details Experimental determination of the effective strong coupling constant Experimental determination of the effective strong coupling constant

2005-09-12

arxiv.org/abs/hep-ph/0509113v3

Phys.Lett.B650:244-248,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Published in Physics Letters B 650 4 244

Scientific paper

10.1016/j.physletb.2007.05.015

We present a first attempt to experimentally extract an effective strong coupling constant that we define to be a low Q2 extension of a previous definition by S. Brodsky et al. following an initial work of G. Grunberg. Using Jefferson Lab data and sum rules, we establish its Q2-behavior over the complete Q2-range. The result is compared to effective coupling constants inferred from different processes and to calculations based on Schwinger-Dyson equations, hadron spectroscopy or lattice QCD. Although the connection between the experimentally extracted effective coupling constants and the calculations is not established it is interesting to note that their behaviors are similar.

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