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Results are presented on $\psi(2S)$ and $J/\psi$ hadronic decays to$K^0_SpK^-\bar n$ and $K^0_S\bar p K^+n$ final states from data samples of 14million $\psi(2S)$ and 58 million $J/\psi$ events accumulated at the BES IIdetector. No $\Theta(1540)$ signal, the pentaquark candidate, is observed, andupper limits for ${\cal B}(\psi(2S)\to\Theta\bar\Theta\to K^0_S p K^-\bar n +K^0_S \bar p K^+ n) < 0.84\times 10^{-5}$ and ${\calB}(J/\psi\to\Theta\bar\Theta\to K^0_S p K^-\bar n + K^0_S \bar p K^+ n) <1.1\times 10^{-5}$ at the 90% confidence level are set. For single$\Theta(1540)$ production, the upper limits determined by our analysis are alsoon the order of $10^{-5}$ in both $\psi(2S)$ and $J/\psi$ decays.Comment: 13 pages, 6 figures, 2 table

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Search for the pentaquark state inψ(2S)andJ/ψdecays toK