First observation of J/ψand ψ(2S) decaying to n K^0_S\barΛ +c.c

Details First observation of J/ψand ψ(2S) decaying to n K^0_S\barΛ +c.c First observation of J/ψand ψ(2S) decaying to n K^0_S\barΛ +c.c

2007-10-16

arxiv.org/abs/0710.3091v3

Phys.Lett.B659:789-795,2008

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 10 figures

Scientific paper

10.1016/j.physletb.2007.11.087

The decays of $\jpsi$ and $\psip$ to ${n}{K^0_S}\bar{\Lambda}+c.c.$ are observed and measured for the first time, and the perturbative QCD ``12%'' rule is tested, based on $5.8 \times 10^7$ $\jpsi$ and $1.4 \times 10^7$ $\psip$ events collected with BESII detector at the Beijing Electron-Positron Collider. No obvious enhancement near $n\bar{\Lambda}$ threshold in $\jpsi \to {n}{K^0_S}\bar{\Lambda}+c.c.$ is observed, and the upper limit on the branching ratio of $\jpsi \to {K^0_S} X, X \to n \bar \Lambda$ is determined.

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