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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*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.

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Garcıa-Recio, C., Nieves, J. & Salcedo, L.L. Resonances and the Weinberg-Tomozawa 56-baryon-35-meson interaction. Eur. Phys. J. A 31, 499–502 (2007). https://doi.org/10.1140/epja/i2006-10203-9

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  • DOI: https://doi.org/10.1140/epja/i2006-10203-9

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