Flavor SU(4) breaking between effective couplings

• Autor(a) principal: El-Bennich, Bruno [UNESP]
• Data de Publicação: 2012
• Outros Autores: Krein, Gastão [UNESP], Chang, Lei, Roberts, Craig D., Wilson, David J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevD.85.031502; http://hdl.handle.net/11449/226726

Using a framework in which all elements are constrained by Dyson-Schwinger equation studies in QCD, and therefore incorporate a consistent, direct and simultaneous description of light- and heavy-quarks and the states they constitute, we analyze the accuracy of SU(4)-flavor symmetry relations between πρπ, KρK, and DρD couplings. Such relations are widely used in phenomenological analyses of the interactions between matter and charmed mesons. We find that while SU(3)-flavor symmetry is accurate to 20%, SU(4) relations underestimate the DρD coupling by a factor of 5. © 2012 American Physical Society.