Search for the Pentaquark State in $ψ(2S)$ and $J/ψ$ Decays to $K^0_SpK^-\bar n$ and $K^0_S\bar p K^+n$
Results are presented on $ψ(2S)$ and $J/ψ$ hadronic decays to $K^0_SpK^-\bar n$ and $K^0_S\bar p K^+n$ final states from data samples of 14 million $ψ(2S)$ and 58 million $J/ψ$ events accumulated at the BES II detector. No $Θ(1540)$ signal, the pentaquark candidate, is observed, and upper limits for ${\cal B}(ψ(2S)\toΘ\barΘ\to K^0_S p K^-\bar n + K^0_S \bar p K^+ n) < 0.84\times 10^{-5}$ and ${\cal B}(J/ψ\toΘ\barΘ\to K^0_S p K^-\bar n + K^0_S \bar p K^+ n) < 1.1\times 10^{-5}$ at the 90% confidence level are set. For single $Θ(1540)$ production, the upper limits determined by our analysis are also on the order of $10^{-5}$ in both $ψ(2S)$ and $J/ψ$ decays.
hep-ex↗