Structure of f0(980) from a Coupled Channel Analysis of S-wave pi pi Scattering

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 KKbar threshold, as found in many data fits and confirmed here, can be reconciled with the KKbar 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.

arXiv comment18 pages, 14 figures, published in Eur. Phys. J. C (online: February 20, 1998). The problem is more fully explored in the updated version: the model includes the direct coupling of qqbar channel to both pipi and KKbar channels, three new figures are added, and two data fits showing different possibilities of the interaction between the KKbar and qqbar states are presented and discussed

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