A non-perturbative chiral approach for meson-meson interactions
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A non-perturbative chiral approach for meson-meson interactions

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A non-perturbative chiral approach for meson-meson interactions

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Oller Berber, José Antonio; Oset Báguena, Eulogio Perfil; Guerrero Cortina, Francisco; Peláez Sagredo, José Ramón
This document is a artículoDate2000
A non-perturbative method which combines constraints from chiral symmetry breaking and coupled channel unitarity is used to describe meson-meson interactions up to \sqrt{s}\lesssim 1.2 GeV, extending in this way the range of applicability of the information contained in Chiral Perturbation Theory (\chi PT), since this perturbative series is typically restricted to \sqrt{s}\lesssim 500 MeV. The approach uses the O(p^2) and O(p^4) \chiPT Lagrangians. The seven free parameters resulting from the O(p^4) Lagrangian are fitted to the experimental data. The approach makes use of the expansion of T^{-1} instead of the amplitude itself as done in \chiPT. The former expansion is suggested by analogy with the effective range approximation in Quantum Mechanics and it appears to be very useful. The results, in fact, are in good agreement with a vast amount of experimental analyses.

    Oller Berber, José Antonio Oset Báguena, Eulogio Guerrero Cortina, Francisco Peláez Sagredo, José Ramón 2000 A non-perturbative chiral approach for meson-meson interactions Nuclear Physics A 663 991C 994C
http://dx.doi.org/10.1016/S0375-9474(99)00751-4
distribuido bajo licencia Creative Commons de Reconocimiento-NoComercial 3.0 No adaptada

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