Meson-Meson interaction in a non-perturbative chiral approach

Details Meson-Meson interaction in a non-perturbative chiral approach Meson-Meson interaction in a non-perturbative chiral approach

1998-04-02

arxiv.org/abs/hep-ph/9804209v1

Phys.Rev.D59:074001,1999; Erratum-ibid.D60:099906,1999; Erratum-ibid.D75:099903,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 12 figures. LaTeX, uses psfig

Scientific paper

10.1103/PhysRevD.59.074001

A non-perturbative method which combines constraints from chiral symmetry breaking and coupled channel unitarity is used to describe the meson-meson interaction up to about 1.2 GeV. The approach uses the O(p^2) and O(p^4) chiral Lagrangians. The seven free parameters of the O(p^4) Lagrangian are fitted to the data. The results are in good agreement with a vast amount of experimental analyses. The amplitudes develop poles in the complex plane corresponding to the f0, a0, rho, K*, phi, sigma and kappa resonances; the latter two, very broad. The total and partial decay widths of the resonances are also well reproduced. Further extensions and applications of this chiral non-perturbative scheme are also discussed.

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