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

Understand

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.