$\Xi$ spectroscopy in photoproduction on a proton target at Jefferson Lab

The CLAS Collaboration at Jefferson Lab conducted a photoproduction experiment on a proton target using a tagged photon beam with an energy range of 1.6-3.8~GeV during May-July 2004. With an integrated luminosity of about 70 $pb^{-1}$, this experiment provides the largest data set for photon-proton reactions ever collected. The reaction $\gamma p \rightarrow K^+K^+\Xi^{-}(1320)$ has been investigated with the two $K^+$'s detected by CLAS and $\Xi^{-}(1320)$ constructed from missing four momentum. The preliminary results of the cross section measurement of $\Xi^-(1320)$ for the photon energy range of 2.7-3.8~GeV will be presented. In search for excited cascade states, the reaction of $\gamma p \rightarrow K^+K^+\pi^-(\Xi^0(1320))$ has been explored. Preliminary results of excited cascade states decaying into $\Xi^{0}\pi^{-}$ will be shown. The feasibility of searching for pentaquark cascade states in photoproduction on a proton target will also be discussed.