Abstract
The process γp→ φp close to threshold is investigated focusing on the role played by the s- and u-channel nucleonic resonances. For this purpose, a recent quark model approach, based on the SU(6)⊗ O(3) symmetry with an effective Lagrangian, is extended to the φ meson photoproduction. Another non-diffractive process, the t-channel π 0 exchange, is also included. The diffractive contribution is produced by the t-channel Pomeron exchange. Contributions from non-diffractive s- and u-channel processes are found small in the case of cross sections and polarization observables at forward angles. However, backward angle polarization asymmetries show high sensitivity to this non-diffractive process. Different prescriptions to keep gauge invariance for the Pomeron exchange amplitudes are investigated. Possible deviations from the exact SU(6)⊗ O(3) symmetry, due to the configuration mixing, are also discussed.
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