Analytic Model for the QCD Running Coupling with Universal α¯s(0) Value

D. V. Shirkov and I. L. Solovtsov
Phys. Rev. Lett. 79, 1209 – Published 18 August 1997
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Abstract

We discuss the new model expression α¯an(Q2) recently obtained for the QCD running coupling with a regular ghost-free behavior in the “low Q2” region. Being deduced from the standard “asymptotic-freedom” expression by imposing the Q2 analyticity—without any adjustable parameters—it has nice features: (i) The universal limiting value α¯an(0)=4π/β0 expressed only via group symmetry factors and independent of experimental estimates on the running coupling α¯s(Q2) (of QCD scale parameter Λ). This value is stable with respect to higher order corrections. (ii) Stability of IR behavior with respect to higher-loop effects. (iii) Coherence between the experimental α¯an(Mτ2) value and integral information on IR α¯s(Q2) behavior as extracted from jet physics data.

  • Received 28 October 1996

DOI:https://doi.org/10.1103/PhysRevLett.79.1209

©1997 American Physical Society

Authors & Affiliations

D. V. Shirkov and I. L. Solovtsov

  • Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia

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Vol. 79, Iss. 7 — 18 August 1997

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