Rescattering of the $\Sigma ^{-}$(1385) and the K$^{+}$ on the proton, R.M. Davis (GWU), for the CLAS Collaboration

Due to the short lifetime of excited hyperons, studies on their scattering are lacking. Since neither beams nor targets can be created, the only possibility is to use final-state interactions. We studied the reaction $\gamma $ n $\to $ K$^{+} \quad \Sigma ^{-}$(1385), detecting the K$^{+}$, $\pi ^{-}$, $\pi ^{-}$, p in the final state. These data were obtained in the g10 experiment at Jefferson Lab, which used real photons and a deuterium target in the CLAS. The $\Sigma ^{-}$(1385) and the intermediate $\Lambda $ were identified from their invariant masses. The additional 'spectator' proton was either detected or identified by missing mass. Once all particles were identified, we were able to look for high-t events with spectator proton momenta above 0.4 GeV/c. Though the statistics are limited, we plan to determine the quasifree and the rescattering cross sections.