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Starting from the chiral perturbation theory Lagrangian, but keeping different masses for the charged and neutral mesons (m_u ? m_d), and using a previously developed nonperturbative unitary scheme that generates the lightest meson-meson resonan[...]texto impreso
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Oller, J. A. ; Oset, E. ; Guerrero, F. ; Peláez Sagredo, José Ramón | Elsevier Science BV | 2000-01-31A non-perturbative method [1] which combines constraints from chiral symmetry breaking and coupled channel unitarity is used to describe meson-meson interactions up to ?stexto impreso
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By means of a coupled channel non-perturbative unitary approach, it is possible to extend the strong constrains of Chiral Perturbation Theory to higher energies. In particular, it is possible to reproduce the lowest lying resonances in meson-mes[...]texto impreso
Oset, E. ; Hosaka, A ; Nacher, J. C. ; Oka, M. ; Oller, J. A. ; Parreño, A. ; Peláez Sagredo, José Ramón ; Ramos, A. ; Toki, H. | Elsevier Science BV | 2000-01-31We report on recent progress on the chiral unitary approach, which is shown to have a much larger convergence radius than ordinary chiral perturbation theory, allowing one to reproduce data for meson meson interaction up to 1.2 GeV and meson bar[...]
