Resonances , Chiral Symmetry , Coupled Channel Unitarity and Effective
نویسنده
چکیده
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-meson scattering up to 1.2 GeV using the parameters of the O(p) and O(p) Chiral Lagrangian. We report on an update of these results examining their possible relevance for meson spectroscopy.
منابع مشابه
Chiral Symmetry Amplitudes in the S-wave Isoscalar and Isovector Channels
We use a nonpertubative 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 σ, f0 and a0 resonances. The ππ → ππ , ππ → K...
متن کاملar X iv : h ep - p h / 98 09 33 7 v 1 1 1 Se p 19 98 N D Description of Two Meson Amplitudes and Chiral Symmetry
The most general structure of an elastic partial wave amplitude when the left hand cut is neglected is deduced in terms of the N/D method. This result is then matched to lowest order, O(p 2), Chiral Perturbation Theory and to the exchange (consistent with chiral symmetry) of resonances in the s-channel. The extension of the method to coupled channels is also given. Making use of the former form...
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متن کاملar X iv : h ep - p h / 98 09 33 7 v 2 2 1 M ay 1 99 9 N D Description of Two Meson Amplitudes and Chiral Symmetry
The most general structure of an elastic partial wave amplitude when the unphysical cuts are neglected is deduced in terms of the N/D method. This result is then matched to lowest order, O(p 2), Chiral Perturbation Theory(χPT) and to the exchange (consistent with chiral symmetry) of resonances in the s-channel. The extension of the method to coupled channels is also given. Making use of the for...
متن کاملDescription of Two Meson Amplitudes and Chiral Symmetry
The most general structure of an elastic partial wave amplitude when the unphysical cuts are neglected is deduced in terms of the N/D method. This result is then matched to lowest order, O(p2), Chiral Perturbation Theory(χPT) and to the exchange (consistent with chiral symmetry) of resonances in the s-channel. The extension of the method to coupled channels is also given. Making use of the form...
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