Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-10-31
Contribution to the Proceedings of HADRON'97, 25-30 August 1997, Brookhaven National Laboratory, NY
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, Latex, macros aipproc.sty,aipproc.cls
Scientific paper
We use a non-perturbative approach which combines coupled channel Lippmann-Schwinger equations with meson-meson potentials provided by the lowest order chiral Lagrangian. By means of one parameter, a cut off in the momentum of the loop integrals, which results of the order of 1 GeV, we obtain singularities in the S-wave amplitudes corresponding to the sigma, f_0 and a_0 resonances. The \pi\pi --> \pi\pi, \pi\pi --> K bar(K) phase shifts and inelasticities in the T=0 scalar channel are well reproduced as well as the \pi^0 eta and K bar(K) mass distributions in the T=1 channel. Furthermore, the total and partial strong decay widths of the f_0 and a_0 resonances are properly reproduced.
Oller Jose Antonio
Oset Eulogio
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