Nucleonic resonance excitations with linearly polarized photons in gamma p ->omega p

作者：Zhao Q^*

来源：Physical Review C, 2001, 63(2): 025203.

DOI：10.1103/PhysRevC.63.025203

In this work, an improved quark model approach to the omega meson photoproduction with an effective Lagrangian is presented. The t-channel natural-parity exchange is taken into account through the Pomeron exchange, while the 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 s-channel individual resonances in the SU(6) x O(3) quark model symmetry limit. Especially, the two resonances P-13(1720) and F-15(1680), which belong to the representation [56, (2)8, 2,2,J], have dominant contributions over other excited states. Concerning the essential motivation of searching for "missing resonances" in meson photoproduction, this approach provides a feasible framework, on which systematic investigations can be done.

• 出版日期2001-2