Flavor SU(4) breaking between effective couplings

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.

5 pages, two figures

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• Leading-twist parton distribution amplitudes of S-wave heavy-quarkonia
• Exciting flavored bound states
• Hidden beauty baryon states in the local hidden gauge approach with heavy quark spin symmetry
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• Off-shell persistence of composite pions and kaons
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• Strong couplings and form factors of charmed mesons in holographic QCD
• A combined study of the pion's static properties and form factors
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• Interplay of dynamical and explicit chiral symmetry breaking effects on a quark
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• Leading-twist distribution amplitudes of scalar- and vector-mesons
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• SU(4) flavor symmetry breaking in D-meson couplings to light hadrons
• The Charm and Beauty of Strong Interactions
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• Mesonic Decay of Charm Hypernuclei ${\Lambda }_c^{+}$