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

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

2008-03-28

arxiv.org/abs/0803.4119v2

Phys.Lett.B665:349-351,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Updated to the version published in PLB (minor modifications)

Scientific paper

10.1016/j.physletb.2008.06.049

We present a new extraction of the effective strong coupling constant \alpha_{s,g_1}(Q^2). The result agrees with a previous determination and extends 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 experimentally verifies the lack of Q^2-dependence of \alpha_{s,g_1}(Q^2) in the low Q^2 limit. This fact is necessary for application of the AdS/CFT correspondence to QCD calculations. We provide a parameterization of \alpha_{s,g_1}(Q^2) thatcan equivalently be used to parameterize the Q^2-dependence of the generalized Gerasimov-Drell-Hearn and Bjorken sums.

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