Symmetry-preserving contact interaction model for heavy-light mesons

• Autor(a) principal: Serna, F. E. [UNESP]
• Data de Publicação: 2016
• Outros Autores: Brito, M. A. [UNESP], Krein, G. [UNESP], Andrianov, A., Brambilla, N., Kim, V, Kolevatov, S.
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1063/1.4938727; http://hdl.handle.net/11449/161288
• topic: Regularization of ultraviolet divergences; Ward-Green-Takahashi identities; Dyson-Schwinger and Bethe-Salpeter equations

We use a symmetry-preserving regularization method of ultraviolet divergences in a vector-vector contact interaction model for low-energy QCD. The contact interaction is a representation of nonperturbative kernels used Dyson-Schwinger and Bethe-Salpeter equations. The regularization method is based on a subtraction scheme that avoids standard steps in the evaluation of divergent integrals that invariably lead to symmetry violation. Aiming at the study of heavy-light mesons, we have implemented the method to the pseudoscalar pi and K mesons. We have solved the Dyson-Schwinger equation for the u, d and s quark propagators, and obtained the bound-state Bethe-Salpeter amplitudes in a way that theWard-Green-Takahashi identities reflecting global symmetries of the model are satisfied for arbitrary routing of the momenta running in loop integrals.