M ar 1 99 9 The Unitary Mechanism of Infrared Freezing in QCD with massive gluons
نویسنده
چکیده
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 α s (Q 2) 1.
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تاریخ انتشار 1999