Speaker
Prof.
Dubravko KLABUCAR
(Physics Department, PMF, Zagreb University)
Description
The analytic structure of certain Ansaetze for quark propagators
in the nonperturbative regime of QCD is investigated. When choosing
physically motivated parameterization of the momentum-dependent
dressed quark mass function M(p^2), with definite analytic structure,
it is highly nontrivial to predict and control the analytic structure
of the corresponding nonperturbative quark propagator. The issue of
the Wick rotation relating the Minkowski-space and Euclidean-space
formulations is also highly nontrivial in the nonperturbative case.
A propagator form allowing the Wick rotation and enabling equivalent
calculations in Minkowski and Euclidean spaces is presented. In
spite of its simplicity, this model yields good qualitative and
semi-quantitative description of some pseudoscalar meson processes.
Extension to finite densities and temperatures is possible.
Primary author
Prof.
Dubravko KLABUCAR
(Physics Department, PMF, Zagreb University)
