Search for the Pentaquark State in $\psi (2S)$ and $J/\psi$ Decays to $K_S^{0}p{K}^{-}\bar{n}$ and $K_S^0\bar{p}{K}^{+}n$

Abstract

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

13 pages, 6 figures, 2 tables

References in corpus (5)

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• K+ nucleon scattering and exotic S=+1 Baryons
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners

Cited by in corpus (76)

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