Interplay of quark and meson degrees of freedom in a near-threshold resonance: Multi-channel case |
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Authors: | C Hanhart Yu S Kalashnikova A V Nefediev |
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Institution: | 1.Forschungszentrum Jülich,Institute for Advanced Simulation, Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics,Jülich,Germany;2.Institute for Theoretical and Experimental Physics,Moscow,Russia |
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Abstract: | 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 possible 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. |
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