Abstract
The one-loop QCD effective charge α eff s for quark-quark scattering is derived by diagrammatic resummation of the one-loop amplitude using an arbitrary covariant gauge. Except for the particular choice of gauge parameter ξ = −3, α eff s is found to increase with increasing physical scale, Q, as lnQ or ln2 Q. For ξ = −3, α eff s decreases with increasing Q and satisfies a renormalization group equation. Also, except for the case ξ = 19/9, convergence radii of geometric series are found to impose upper limits on Q.
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Field, J.H. Convergence and gauge dependence properties of the resummed one-loop quark-quark scattering amplitude in perturbative QCD. Phys. Part. Nuclei 40, 353–367 (2009). https://doi.org/10.1134/S1063779609030046
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DOI: https://doi.org/10.1134/S1063779609030046