Determination of the effective strong coupling constant αs, g1 (Q2) from CLAS spin structure function data

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

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115 Scopus citations

Abstract

We present a new extraction of the effective strong coupling constant αs, g1 (Q2). The result agrees with a previous determination and extends the measurement of the low and high Q2 behavior of αs, g1 (Q2) that was previously deduced from sum rules. In particular, it experimentally verifies the lack of Q2-dependence of αs, g1 (Q2) in the low Q2 limit. This fact is necessary for application of the AdS/CFT correspondence to QCD calculations. We provide a parameterization of αs, g1 (Q2) that can equivalently be used to parameterize the Q2-dependence of the generalized Gerasimov-Drell-Hearn and Bjorken sums.

Original languageEnglish
Pages (from-to)349-351
Number of pages3
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume665
Issue number5
DOIs
StatePublished - Jul 31 2008

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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