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Reconciling the light scalar mesons with Breit-Wigner resonances as well as the quark model

Authors: E. van Beveren and G. Rupp

Ref.: Int.J.Theor.Phys.Group Theor.Nonlin.Opt. 11, 179-206 (2006)

Abstract: Resonances appearing in hadronic scattering processes are described by a two-phase model. In the one phase, scattering products are observed, whereas the other phase describes confinement. A so-called ``Resonance-Spectrum Expansion'' is derived, containing expressions that resemble Breit-Wigner formulae. This method also provides a straightforward explanation for the origin of the light scalar mesons without requiring extra degrees of freedom.