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

Abstract

We report the results of a high-statistics, sensitive search for narrow baryon resonances decaying to ${\Xi }^{-}{\pi }^{-}$, ${\Xi }^{-}{\pi }^{+}$, ${\bar{\Xi }}^{+}{\pi }^{-}$, and ${\bar{\Xi }}^{+}{\pi }^{+}$. The only resonances observed are the well known ${\Xi }^0(1530)$ and $\overline{{\Xi }^0}(1530)$. 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 $\sigma =7.6$ MeV in the ${\Xi }^{-}{\pi }^{-}$ effective mass spectrum to be 0.3% of the number of observed ${\Xi }^0(1530)\to {\Xi }^{-}{\pi }^{+}$. We find similarly restrictive upper limits for an enhancement at 1862 MeV in the ${\Xi }^{-}{\pi }^{+}$, ${\bar{\Xi }}^{+}{\pi }^{-}$, and ${\bar{\Xi }}^{+}{\pi }^{+}$ mass spectra.

Submitted to PRL

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Cited by in corpus (8)

• Production of $\Sigma (1385{)}^{\pm }$ and $\Xi (1530{)}^0$ in proton-proton collisions at $\sqrt{s}=$ 7 TeV
• Present status on experimental search for pentaquarks
• Search for a pentaquark decaying to p K_S^0
• Search for a pentaquark decaying to Cascade- pi-
• Search for Exotic S=-2 Baryons in proton-antiproton Collisions at sqrt(s) = 1.96 TeV
• Positive parity pentaquark towers in large Nc QCD
• Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron
• Prediction of the masses and decay processes of strange, charmed and bottomed pentaquarks from the linear molecular crypto-heptaquark model