2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 4, 317-326
DOI 10.1007/s100529800766

Structure of f0(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

A coupled channel model is used to study the nature of the f0(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 f0(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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