S = -1 meson-baryon scattering in coupled-channel unitarized Chiral Perturbation Theory
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S = -1 meson-baryon scattering in coupled-channel unitarized Chiral Perturbation Theory

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S = -1 meson-baryon scattering in coupled-channel unitarized Chiral Perturbation Theory

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García Recio, Carmen; Nieves Pamplona, Juan Miguel; Ruiz Arriola, Enrique; Vicente Vacas, Manuel José
Aquest document és un/a article, creat/da en: 2003
The s-wave meson-baryon scattering amplitude is analyzed for the strangeness S = -1 and isospin I = 0 sector in a Bethe-Salpeter coupled-channel formalism incorporating Chiral Symmetry. Four two-body channels have been considered: (K) over barN, piSigma, etaLambda, KXi. The needed two-particle irreducible matrix amplitude is taken from lowest-order Chiral Perturbation Theory in a relativistic formalism. Off-shell behaviour is parameterized in terms of low-energy constants, which outnumber those assumed in previous works and provide a better fit to the data. The position of the complex poles in the second Riemann sheet of the scattering amplitude determines masses and widths of the Lambda(1405) and Lambda(1670) resonances which compare well with accepted numbers.

    García Recio, Carmen Nieves Pamplona, Juan Miguel Ruiz Arriola, Enrique Vicente Vacas, Manuel José 2003 S = -1 meson-baryon scattering in coupled-channel unitarized Chiral Perturbation Theory European Physical Journal A 18 2-3 185 187
http://dx.doi.org/10.1140/epja/i2002-10297-y
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