Abstract
We consider the lightest scalar meson in the frame of the linear model, keeping in mind that this model could be the low energy realization of two-flavor QCD. We show that the field is described by its four-quark component at least in the resonance energy (virtuality) region and the decay is the four-quark transition. We emphasize that residues of the pole in the and amplitudes do not give an idea about the meson nature, and the progress in studying the meson production mechanisms in different processes could essentially further us in understanding its nature.
- Received 19 April 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.072001
©2007 American Physical Society