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.
Highlights
In Quantum Chromodynamics (QCD), the gauge theory of the strong force, the magnitude of the coupling is given by the running coupling constant αs
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
While αs is well defined within perturbative QCD at large Q2 [1], these calculations lead to an infinite coupling at large distances
Summary
In Quantum Chromodynamics (QCD), the gauge theory of the strong force, the magnitude of the coupling is given by the running coupling constant αs. We present a new extraction of the effective strong coupling constant αs,g1(Q2). An effective strong coupling constant, αs,g1, has been extracted [5] from experimental data on the Bjorken sum [6].
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