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

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

2010-01-03

arxiv.org/abs/1001.0369v3

Eur.Phys.J.A44:93-103,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX2e, 11 pages, minor typo corrections, to appear in Eur.Phys.J.A

Scientific paper

10.1140/epja/i2010-10929-7

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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