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On the QCD coupling behavior in the infrared region

D. V. Shirkov
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Abstract

The summary of nonperturbative results for the QCD invariant coupling bar{alpha}_s obtained by lattice simulations for functional integral and by solution of approximate Dyson--Schwinger equations reveals a puzzling variety of IR behavior of bar{alpha}_s(Q^2) even on a qualitative level. This, in turn, rises a question of correspondence between the results obtained so far by different groups. We analyze this issue in terms of mass-dependent coupling constant transformations and conclude that the question of the IR behavior of effective QCD coupling and of propagators is not a well--defined one and needs to be more specified.

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D. V. Shirkov. 2002-08-08. On the QCD coupling behavior in the infrared region. https://arxiv.org/abs/hep-ph/0208082

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