Nucleonic resonance effects in the phi meson photoproduction

作者：Zhao Q^*; Didelez JP; Guidal M; Saghai B

来源：Nuclear Physics A, 1999, 660(3): 323-347.

DOI：10.1016/S0375-9474(99)00398-X

• phenomenological quark model
• photoproduction reactions
• meson production
• polarization

The process gamma p --> phi p close to threshold is investigated focusing on the role played by the sand u-channel nucleonic resonances. For this purpose, a recent quark model approach, based on the SU(6) x O(3) symmetry with an effective Lagrangian, is extended to the phi meson photoproduction. Another non-diffractive process, the t-channel pi(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) x O(3) symmetry, due to the configuration mixing, are also discussed.

• 出版日期1999-11-29
• 单位中国地震局