DOI 10.1007/s100529800766
Structure of f0(980) from a coupled channel
analysis
of S-wave 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 f0(980) resonance.
It is shown that the existence of two poles close to threshold, as
found in many data fits and confirmed here, can be reconciled with
the 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.
Copyright Springer-Verlag