Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-07
Phys.Lett.B485:162-170,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, no figures, no tables, to appear in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(00)00698-5
We have formulated new quantum model of the QCD vacuum using the effective potential approach for composite operators. It is based on the existence and importance of such kind of the nonperturbative, topologically nontrivial excitations of gluon field configurations, which can be effectively correctly described by the $q^{-4}$-type behavior of the full gluon propagator in the deep infrared domain. The ultraviolet part of the full gluon propagator was approximated by the asymptotic freedom to-leading order perturbative logarithm term of the running coupling constant. Despite the vacuum energy density remains badly divergent, we have formulated a method how to establish a finite (in the ultraviolet limit) relation between the two scale parameters of our model. We have expressed the asymptotic scale parameter as $pure number$ times the nonperturbative scale, which is inevitably contained in any realistic Ansatz for the full gluon propagator.
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