Experimental determination of the effective strong coupling constant

A. Deur; V. Burkert; J. P. Chen; W. Korsch

doi:10.1016/j.physletb.2007.05.015

Experimental determination of the effective strong coupling constant

A. Deur, V. Burkert, J. P. Chen, W. Korsch

Physics And Astronomy

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110 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	244-248
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	650
Issue number	4
DOIs	https://doi.org/10.1016/j.physletb.2007.05.015
State	Published - Jul 5 2007

Bibliographical note

Funding Information:
This work was supported by the US Department of Energy (DOE). The Jefferson Science Associates (JSA) operates the Thomas Jefferson National Accelerator Facility for the DOE under contract DE-AC05-84ER40150.

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2007.05.015

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AU - Burkert, V.

AU - Chen, J. P.

AU - Korsch, W.

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AB - 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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Experimental determination of the effective strong coupling constant

Abstract

Bibliographical note

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