Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-06-20
Eur.Phys.J.C22:493-501,2001
Physics
High Energy Physics
High Energy Physics - Experiment
21 pages, 6 figures included. v2, new figures with respect to the movement of singularities in the complex energy plane. Discu
Scientific paper
10.1007/s100520100823
A general expression resembling Breit-Wigner formulae is derived for the description of resonances which appear in meson-meson scattering. Starting point is a unitarised meson model, but reduced to a simpler form and freed from the specific assumption about the confining force. The parameters of the resulting ``Resonance-Spectrum Expansion'' are directly related to the confinement spectrum and the mechanism of $^3P_0$ valence-quark-pair creation for OZI-allowed hadronic decay, and not to the central positions and widths of resonances. The method also provides a straightforward explanation for the origin of the light scalar mesons without requiring extra degrees of freedom.
Beveren Eef van
Rupp George
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