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Interplay of quark and meson degrees of freedom in a near-threshold resonance

We investigate the interplay of quark and meson degrees of freedom in a physical state representing a near-threshold resonance for the case of a single continuum channel. We demonstrate that such a near-threshold resonance may possess quite peculiar properties if both quark and meson dynamics generate weakly coupled near-threshold poles in the S-matrix. In particular, the scattering t-matrix may possess zeros in this case. We also discuss possible implications for production reactions as well as studies within lattice QCD.

preprint2010arXivOpen access
V. BaruC. HanhartYu. S. KalashnikovaA. E. KudryavtsevA. V. Nefediev
hep-ph
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V. BaruC. HanhartYu. S. KalashnikovaA. E. KudryavtsevA. V. Nefediev

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