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The European Physical Journal A

, Volume 31, Issue 4, pp 499–502 | Cite as

Resonances and the Weinberg-Tomozawa 56-baryon-35-meson interaction

  • C. Garcıa-Recio
  • J. Nieves
  • L. L. Salcedo
QNP 2006

Abstract.

Vector meson degrees of freedom are incorporated into the Weinberg-Tomozawa (WT) meson-baryon chiral Lagrangian by using a scheme which relies on spin-flavor SU(6) symmetry. The corresponding Bethe-Salpeter approximation successfully reproduces previous SU(3)-flavor WT results for the lowest-lying s-wave negative-parity baryon resonances, and it also provides some information on the dynamics of the heavier ones. Moreover, it also predicts the existence of an isoscalar spin-parity \( {\frac{3}{2}}\) - K*N bound state (strangeness +1) with a mass around 1.7-1.8GeV, unstable through K* decay. Neglecting d-wave KN decays, this state turns out to be quite narrow ( Γ≤15MeV) and it might provide clear signals in reactions like γp→¯0 pK + π - by looking at the three-body pK + π - invariant mass.

PACS.

11.30.Hv Flavor symmetries 11.10.St Bound and unstable states; Bethe-Salpeter equations 11.30.Rd Chiral symmetries 11.80.Gw Multichannel scattering 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • C. Garcıa-Recio
    • 1
  • J. Nieves
    • 1
  • L. L. Salcedo
    • 1
  1. 1.Departamento de Fısica Atómica, Molecular y NuclearUniversidad de GranadaGranadaSpain

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