Search for an exotic S=-2, Q=-2 baryon resonance at a mass near 1862 MeV in quasi-real photoproduction

Abstract

A search for an exotic baryon resonance with $S=-2,Q=-2$ has been performed in quasi-real photoproduction on a deuterium target through the decay channel ${\Xi }^{-}{\pi }^{-}\to \Lambda {\pi }^{-}{\pi }^{-}\to p{\pi }^{-}{\pi }^{-}{\pi }^{-}$. No evidence for a previously reported ${\Xi }^{--}(1860)$ resonance is found in the ${\Xi }^{-}{\pi }^{-}$invariant mass spectrum. An upper limit for the photoproduction cross section of 2.1 nb is found at the 90% confidence level. The photoproduction cross section for the ${\Xi }^0(1530)$ is found to be between 9 and 24 nb.