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Interplay of quark and meson degrees of freedom in a near-threshold resonance: multi-channel case

We investigate the interplay of quark and meson degrees of freedom in a physical state representing a near-threshold resonance for the case of multiple continuum channels. The aim is to demonstrate the full complexity of near-threshold phenomena. It turns out that those are especially rich, if both quark and meson dynamics generate simultaneously weakly coupled near-threshold poles in the S-matrix. We study the properties of this scenario in detail, such as t-matrix and production amplitude zeros, as well as various effects of the continuum channels interplay.

preprint2011arXivOpen access
C. HanhartYu. S. KalashnikovaA. V. Nefediev
hep-exhep-ph
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C. HanhartYu. S. KalashnikovaA. V. Nefediev

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