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

C. Garcia-Recio·J. Nieves·L. L. Salcedo
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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 $\frac32^-$ $K^*N$ bound state (strangeness +1) with a mass around 1.7--1.8 GeV, unstable through $K^*$ decay. Neglecting d-wave KN decays, this state turns out to be quite narrow ($Γ\le 15$ MeV) and it might provide clear signals in reactions like $γp \to \bar K^0 p K^+π^-$ by looking at the three body $p K^+π^-$ invariant mass.

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C. Garcia-Recio, J. Nieves, L. L. Salcedo. 2006-11-16. Resonances and the Weinberg--Tomozawa 56-baryon --35-meson interaction. https://doi.org/10.1140/epja%2Fi2006-10203-9

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