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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 4 Issue 2 (1998) pp 317-326
DOI 10.1007/s100529800766
theoretical physics:
Structure of $f_0(980)$ from a coupled channel analysis of $S$-wave $\pi\pi$ scattering
M.P. Locher, V.E. Markushin, H.Q. Zheng
Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Received: 6 May 1997 / Revised version: 26 September 1997 / Published online: 20 February 1998
Abstract. A coupled channel model is used to study the nature of the $f_0(980)$ resonance. It is shown that the existence of two poles close to $K\bar{K}$ threshold, as found in many data fits and confirmed here, can be reconciled with the $K\bar{K}$ molecular origin of the $f_0(980)$. Due to a strong coupling between channels the number of the $S$-matrix poles close to the physical region in the physical case exceeds the number of bare states introduced in the model.
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Online publication: June 23, 1998
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