Determination of the effective strong coupling constant from CLAS spin structure function data

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