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Meson-meson interactions in a nonperturbative chiral approach

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Meson-meson interactions in a nonperturbative chiral approach

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Oller Berber, José Antonio; Oset Báguena, Eulogio; Peláez Sagredo, José Ramón

Aquest document és un/a article, creat/da en: 1999

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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