Transverse part of the quark-gluon vertex and quark propagator in infrared regionстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The Schwinger-Dyson equation for the quark propagator in QCD infrared region is investigated with due regard to gauge identity. The examples of possible transversal arbitrariness in quark-gluon vertex are presented. The account of the transverse part of the vertex is shown to be able to influence drastically the properties of the solutions obtained; in the general case an explicit expression for the solution is obtained, which depends on the form of the transverse part. Some particular cases and properties of corresponding solutions (nonperturbative character, chiral symmetry breaking, etc) are considered. A class of the solutions, which have massive poles with the mass m, is investigated by the effective potential method. It is shown that starting from some value of the quark bare mass m(o) the solutions with m not-equal 0 become energy preferable.