Nucleon resonances in omega photoproduction

Abstract

The role of the nucleon resonances ($N^{\ast }$) in $\omega$ photoproduction is investigated by using the resonance parameters predicted by Capstick and Roberts [Phys. Rev. D {\bf 46}, 2864 (1992); {\bf 49}, 4570 (1994)]. In contrast with the previous investigations based on the $SU(6)\times O(3)$ limit of the constituent quark model, the employed $N^{\ast }\to \gamma N$ and $N^{\ast }\to \omega N$ amplitudes include the configuration mixing effects due to the residual quark-quark interactions. The contributions from the nucleon resonances are found to be significant relative to the non-resonant amplitudes in changing the differential cross sections at large scattering angles and various spin observables. In particular, we suggest that a crucial test of our predictions can be made by measuring the parity asymmetry and beam-target double asymmetry at forward scattering angles.

arXiv comment18 pages, REVTeX, 8 figures, to appear in Phys. Rev. C

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• $N^{\ast }$ decays to $N\omega$ from new data on $\gamma p\to \omega p$
• Nucleon pole contributions in $J/\psi \to N\bar{N}\pi$, $p\bar{p}\eta$, $p\bar{p}{\eta }^{\prime }$ and $p\bar{p}\omega$ decays
• Vector Meson Photoproduction with a Linearly Polarized Beam
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• Assocative Photoproduction of Roper Resonance and $\omega$-Meson
• First Measurements of the Double-Polarization Observables $F$, $P$, and $H$ in $\omega$ Photoproduction off Transversely Polarized Protons in the $N^{\ast }$ Resonance Region