2010

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

Baru, V., Hanhart, C., Kalashnikova, Yu. S. et al.

Understand

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.

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