Study on the reaction of $\gamma p o f_1(1285) p$ in Regge-effective Lagrangian approach

摘要

The production of the $f_1(1285)$ resonance in the reaction of $\gamma p\rightarrow f_1(1285) p$ is investigated within a Regge-effective Lagrangianapproach. Besides the contributions of the $t$-channel $\rho$ and $\omega$trajectories exchanges, we also take into account the contributions of$s/u$-channel $N(2300)$ terms, $s/u$-channel nucleon terms, and the contactterm. By fitting to the CLAS data, we find that the $s$-channel $N(2300)$ termplays an important role in this reaction. We predict the total cross sectionfor this reaction, and find a clear bump structure around $W=2.3$ GeV, which isassociated with the $N(2300)$ state. The reaction of $\gamma p \to f_1(1285) p$could be useful to further study of the $N(2300)$ experimentally.