Following Gluonic World Lines to Find the QCD Coupling in the Infrared

Details Following Gluonic World Lines to Find the QCD Coupling in the Infrared Following Gluonic World Lines to Find the QCD Coupling in the Infrared

2007-02-22

arxiv.org/abs/hep-ph/0702227v1

Eur.Phys.J.C51:633-644,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 5 figures

Scientific paper

10.1140/epjc/s10052-007-0302-y

Using a parametrization of the Wilson loop with the minimal-area law, we calculate the polarization operator of a valence gluon, which propagates in the confining background. This enables us to obtain the infrared freezing (i.e. finiteness) of the running strong coupling in the confinement phase, as well as in the deconfinement phase up to the temperature of dimensional reduction. The momentum scale defining the onset of freezing is found both analytically and numerically. The nonperturbative contribution to the thrust variable, originating from the freezing, makes the value of this variable closer to the experimental one.

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