Roles of nucleon resonances in u0002(1520) photoproduction off the proton

摘要

In this work the roles of the nucleon resonances in the u0002(1520) photoproduction off a proton target areninvestigated within the effective Lagrangian method. Besides the Born terms, including the contact term and s,nu, and K exchanged t channels, the vector meson Kn∗ exchanged t channel is considered in our investigation,nwhich is negligible at low energy and important at high energy. The important nucleon resonances predictednby the constituent quark model (CQM) are considered and the results are found to be well comparable withnthe experimental data. Besides the dominant D13(2080), the resonance [ 5n2n−n]2(2080) predicted by the CQM isnfound to be important for reproducing the experimental data. Other nucleon resonances are found to give smallncontributions in the channel considered in this work. With all important nucleon resonances predicted by thenCQM, the prediction of the differential cross section at an energy up to 5.5 GeV is presented also; this can benchecked by future CLAS experimental data.