Eur. Phys. J. A (2011) 47: 101
https://doi.org/10.1140/epja/i2011-11101-9

Regular Article - Theoretical Physics

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

¹ Forschungszentrum Jülich, Institute for Advanced Simulation, Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics, D-52425, Jülich, Germany
² Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218, Moscow, Russia

^* e-mail: nefediev@itep.ru

Received: 12 June 2011
Revised: 15 July 2011
Accepted: 9 August 2011
Published online: 25 August 2011

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.