Roles of , , and resonances in reaction within an effective Lagrangian approach*

Abstract The roles of the , , and resonances in the reaction near threshold is investigated within an effective Lagrangian approach. The differential cross sections of the reaction was calculated including contributions from the , , and intermediate states decaying into via the s -channel nucleon pole and t -channel ρ exchange. Current experimental measurements were well reproduced. The production of was mainly from the mechanism of the s -channel nucleon pole, while the and were produced from the mechanism of the t -channel ρ exchange. More experimental data on the reaction could be used to explore the properties of the low-lying excited baryon state.