The Unitary Mechanism of Infrared Freezing in QCD with massive gluons

Details The Unitary Mechanism of Infrared Freezing in QCD with massive gluons The Unitary Mechanism of Infrared Freezing in QCD with massive gluons

1999-03-22

arxiv.org/abs/hep-ph/9903431v1

Phys.Atom.Nucl. 62 (1999) 1928-1931; Yad.Fiz. 62 (1999) 2082-2086

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, LaTeX2e

Scientific paper

A "natural" model for the QCD invariant (running) coupling, free of the IR singularity, is proposed. It is based upon the hypothesis of finite gluon mass $ m_{gl}$ existence and, technically, uses an accurate treating of threshold behavior of Feynman diagram contribution. The model correlates with the unitarity condition. Quantitative estimate, performed in the one-loop approximation yields a reasonable lower bound for this mass $m_{gl} > 150$ MeV and a smooth IR freezing at the level $\alpha_s(Q^2)\lesssim 1$.

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