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arXiv · hep-ex/0507056

Search for Exotic Baryons in 800 GeV pp (rtarrow) pXiPiX

D. C. Christian·J. Felix·E. E. Gottschalk·E. P. Hartouni·B. C. Knapp·M. N. Kreisler·G. Moreno·M. A. Reyes·M. Sosa·M. H. L. S. Wang·A. Wehmann
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Abstract

We report the results of a high-statistics, sensitive search for narrow baryon resonances decaying to $Ξ^-π^-$, $Ξ^-π^+$, $\barΞ^+π^-$, and $\barΞ^+π^+$. The only resonances observed are the well known $Ξ^0(1530)$ and $\bar{Ξ^0}(1530)$. No evidence is found for a state near 1862 MeV, previously reported by NA49\cite{NA49}. At the 95% confidence level, we find the upper limit for the production of a Gaussian enhancement with $σ=7.6$ MeV in the $Ξ^-π^-$ effective mass spectrum to be 0.3% of the number of observed $Ξ^0(1530)\toΞ^-π^+$. We find similarly restrictive upper limits for an enhancement at 1862 MeV in the $Ξ^-π^+$, $\barΞ^+π^-$, and $\barΞ^+π^+$ mass spectra.

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D. C. Christian, J. Felix, E. E. Gottschalk, E. P. Hartouni, B. C. Knapp, M. N. Kreisler, G. Moreno, M. A. Reyes, M. Sosa, M. H. L. S. Wang, A. Wehmann. 2005-09-22. Search for Exotic Baryons in 800 GeV pp (rtarrow) pXiPiX. https://doi.org/10.1103/physrevlett.95.152001

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