Naslov
Analytic structure of nonperturbative quark propagators and meson processes

Autori
Kekez, Dalibor ; Klabučar, Dubravko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Annual NewCompStar Conference 2015

Mjesto i datum
Budimpešta, Mađarska, 15.06.2015. - 19.06.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
analytic; propagator; quark; nonperturbative; QCD

Sažetak
The analytic structure of certain Ansaetze for quark propagators in the non-perturbative regime of QCD is investigated. When choosing physically motivated parametrization 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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