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

HERMES Collaboration·A. Airapetian
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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 $Ξ^- π^- \to Λπ^- π^- \to p π^- π^- π^-$. No evidence for a previously reported $Ξ^{--}(1860)$ resonance is found in the $Ξ^- π^-$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 $Ξ^{0}(1530)$ is found to be between 9 and 24 nb.

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HERMES Collaboration, A. Airapetian. 2005-01-23. Search for an exotic S=-2, Q=-2 baryon resonance at a mass near 1862 MeV in quasi-real photoproduction. https://doi.org/10.1103/physrevd.71.032004

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