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Inspired by the preliminary experimental data by the CLAS Collaboration, the$K^{\ast 0}\Lambda$ photoproduction off a neutron is studied within aneffective Lagrangian approach. The contributions from the Born terms including$s$, $u$, and $t$ channels are considered to calculate the amplitude, withwhich the cross sections are calculated and compared with preliminary CLASdata. The theoretical results indicate that the contribution from the$K$-exchange $t$ channel plays a dominant role for the $K^{\ast 0}\Lambda$photoproduction. The contribution from the $\kappa$ exchange is found one orderof magnitude smaller than that from the $K$ exchange. Both the Regge model andthe Feynman model are applied to treat the $t$-channel contribution. Thediscrepancy between two models is found small in the energy range of CLAS dataand predicted to become obvious at energies higher than 3 GeV. More preciseexperimental data especially at backward angles will be helpful to furtherunderstand the interaction mechanism of the $K^{\ast 0}\Lambda$photoproduction.

The $K^{\ast 0}\Lambda$ photoproduction off a neutron