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We present a new extraction of the effective strong coupling constant\alpha_{s,g_1}(Q^2). The result agrees with a previous determination andextends the measurement of the low and high Q^2 behavior of \alpha_{s,g_1}(Q^2)that was previously deduced from sum rules. In particular, it experimentallyverifies the lack of Q^2-dependence of \alpha_{s,g_1}(Q^2) in the low Q^2limit. This fact is necessary for application of the AdS/CFT correspondence toQCD calculations. We provide a parameterization of \alpha_{s,g_1}(Q^2) thatcanequivalently be used to parameterize the Q^2-dependence of the generalizedGerasimov-Drell-Hearn and Bjorken sums.

Determination of the effective strong coupling constant alpha_{s,g_1}(Q^2) from CLAS spin structure function data