An explanation of the ${\Delta }_{5/2^{-}}(1930)$ as a $\rho \Delta$ bound state

Abstract

We use the $\rho \Delta$ interaction in the hidden gauge formalism to dynamically generate $N^{\ast }$ and ${\Delta }^{\ast }$ resonances. We show, through a comparison of the results from this analysis and from a quark model study with data, that the ${\Delta }_{5/2^{-}}(1930),$ ${\Delta }_{3/2^{-}}(1940)$ and ${\Delta }_{1/2^{-}}(1900)$ resonances can be assigned to $\rho \Delta$ bound states. More precisely the ${\Delta }_{5/2^{-}}(1930)$ can be interpreted as a $\rho \Delta$ bound state whereas the ${\Delta }_{3/2^{-}}(1940)$ and ${\Delta }_{1/2^{-}}(1900)$ may contain an important $\rho \Delta$ component. This interpretation allows for a solution of a long-standing puzzle concerning the description of these resonances in constituent quark models. In addition we also obtain degenerate $J^P=1/2^{-},3/2^{-},5/2^{-}$ $N^{\ast }$ states but their assignment to experimental resonances is more uncertain.

19 pags, 8 figs

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• Three body resonances in two meson-one baryon systems
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• ${\bar{K}}^{\ast }$ meson in dense matter
• Open charm meson in nuclear matter at finite temperature beyond the zero range approximation
• Plausible explanation of the ${\Delta }_{5/2^{+}}(2000)$ puzzle
• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton
• The $\varphi p$ bound state in the unitary coupled-channel approximation
• Low mass enhanced probability of pion in hadronic matter due to its Landau cut contributions
• A helpful analogy between the covalent bond and Particle Spectroscopy