The strong coupling constant at low Q2
Abstract
We extract an effective strong coupling constant using low-Q2 data and sum rules. Its behavior is established over the full Q2-range and is compared to calculations based on lattice QCD, Schwinger-Dyson equations and a quark model. Although the connection between all these quantities is not known yet, the results are surprisingly alike. Such a similitude may be related to quark-hadron duality.
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