Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-14
Acta Phys.Polon.Supp.3:931-936,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 2 figures, Acta Physica Polonica B style; plenary talk given by George Rupp at the workshop Excited QCD 2010, 31 Jan.
Scientific paper
Most excited hadrons have multiparticle strong decay modes, which can often be described as resulting from intermediate states containing one or two resonances. In a theoretical approach, such a description in terms of quasi-two-particle initial and final states leads to unitarity violations, because of the complex masses of the involved resonances. In the present paper, an empirical algebraic procedure is presented to restore unitarity of the S-matrix while preserving its symmetry. Preliminary results are presented in a first application to S-wave pion-pion scattering, in the framework of the Resonance-Spectrum Expansion.
Beveren Eef van
Coito Susana
Rupp George
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