On the Analytic "Causal" Model for the QCD Running Coupling
Shirkov, D. V.
Original · EN
We discuss the model αan(Q²) recently proposed for the QCD running coupling αₛ(Q²) in the Euclidean domain on the basis of the "asymptotic-freedom" expression and on causality condition in the form of the Q²-analyticity. The model contains no adjustable parameters and obeys the important features: (i) Finite ghost-free behavior in the "low Q²" region and correspondence with the standard RG-summed UV expressions;% % (ii) The universal limiting value αan(0) expressed only via group symmetry factors. This value as well as the αan behavior in the whole IR region Q² ≤ Λ² turns out to be stable with respect to higher loop corrections; % (iii) Coherence between observed αₛ(Mτ²) value and integral information on the IR αₛ(Q²) behavior extracted from jet physics.
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