Nucleon resonances in omega photoproduction

Details Nucleon resonances in omega photoproduction Nucleon resonances in omega photoproduction

2000-06-25

arxiv.org/abs/nucl-th/0006057v3

Phys.Rev. C63 (2001) 025201

Physics

Nuclear Physics

Nuclear Theory

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

Scientific paper

10.1103/PhysRevC.63.025201

The role of the nucleon resonances ($N^*$) 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 $N^* \to \gamma N$ and $N^* \to \omega N$ 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.

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