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

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 ${\frac{3}{2}}^{-}$ $K^{\ast }N$ bound state (strangeness +1) with a mass around 1.7--1.8 GeV, unstable through $K^{\ast }$ decay. Neglecting d-wave KN decays, this state turns out to be quite narrow ($\Gamma \le 15$ MeV) and it might provide clear signals in reactions like $\gamma p\to {\bar{K}}^{0}p{K}^{+}{\pi }^{-}$ by looking at the three body $p{K}^{+}{\pi }^{-}$ invariant mass.

Talk given at the IVth International Conference on Quarks an Nuclear Physics, Madrid, June 5th-10th 2006. Minor corrections

References in corpus (1)

• Large Nc Weinberg-Tomozawa interaction and negative parity s--wave baryon resonances

Cited by in corpus (4)

• The s-wave charmed baryon resonances from a coupled-channel approach with heavy quark symmetry
• Photon induced Lambda(1520) production and the role of the K^* exchange
• Low-lying even parity meson resonances and spin-flavor symmetry
• Chiral SU(3) Bethe Salpeter Model: Extension to SU(6) and SU(8) Spin-Flavor Symmetries