Nucleonic resonance excitations with linearly polarized photon in $\gamma p\to\omega p$

Abstract : In this work, an improved quark model approach to the $\omega$ meson photo-production with an effective Lagrangian is presented. The {\it t}-channel {\it natural}-parity exchange is taken into account through the Pomeron exchange, while the {\it unnatural}-parity exchange is described by the $\pi^0$ exchange. With a very limited number of parameters, the available experimental data in the low energy regime can be consistently accounted for. We find that the beam polarization observables show sensitivities to some {\it s}-channel individual resonances in the $SU(6)\otimes O(3)$ quark model symmetry limit. Especially, the two resonances $P_{13}(1720)$ and $F_{15}(1680)$, which belong to the representation $[{\bf 56, ^2 8}, 2, 2, J]$, have dominant contributions over other excited states. Concerning the essential motivation of searching for "missing resonances" in meson photo-production, this approach provides a feasible framework, on which systematic investigations can be done.
Document type :
Journal articles

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Submitted on : Monday, March 19, 2001 - 4:22:02 PM
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• HAL Id : in2p3-00018216, version 1

Citation

Q. Zhao. Nucleonic resonance excitations with linearly polarized photon in $\gamma p\to\omega p$. Physical Review C, American Physical Society, 2001, 63, pp.025203-1-025203-10. ⟨in2p3-00018216⟩

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