Published Article / Particle Physics - Phenomenology JINR-E2-97-133 hep-ph/9704333

Analytic Model for the QCD Running Coupling with Universal $\overline{\alpha}_s(0)$ Value

Shirkov, D V ; Solovtsov, I L

Published in: Phys. Rev. Lett.
Year: 1997
Vol.: 79    Num./Issue: 7
Page No: 1209-1212
Pages: 8 p
Year: 1997

Abstract: We discuss the new model expression $\bar{\alpha}_{an}(Q^2)$ recently obtained for the QCD running coupling with a regular ghost-free behavior in the "low $Q^2$" region. Being deduced from the standard "asymptotic-freedom" expression by imposing the $Q^2$-analyticity -- without any adjustable parameters -- it obeys nice features: (i) The universal limiting value symmetry factors and independent of experimental estimates on the running coupling $\bar{\alpha}_s(Q^2)$ (of QCD scale parameter $\Lambda$). This value turns out to be stable with respect to higher order corrections; (ii) Stability of IR behavior with respect to higher-loop effects; (iii) Coherence between the experimental $\bar{\alpha}_{an}(M_{\tau}^2)$ value and integral information on IR $\bar{\alpha}_s(Q^2)$ behavior as extracted from jet physics data.

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