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arXiv · 1111.3647

Flavor SU(4) breaking between effective couplings

Bruno El-Bennich·Gastão Krein·Lei Chang·Craig D. Roberts·David J. Wilson
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Abstract

Using a framework in which all elements are constrained by Dyson-Schwinger equation studies in QCD, and therefore incorporates 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 whilst SU(3)-flavor symmetry is accurate to 20%, SU(4) relations underestimate the DρD coupling by a factor of five.

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Bruno El-Bennich, Gastão Krein, Lei Chang, Craig D. Roberts, David J. Wilson. 2011-11-15. Flavor SU(4) breaking between effective couplings. https://doi.org/10.1103/physrevd.85.031502

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