Flavor SU(4) breaking between effective couplings
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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.
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Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 85, n. 3, 2012.
