Search for Invisible Decays of $η$ and $η^\prime$ in $J/ψ\to φη$ and $φη^\prime$

Details Search for Invisible Decays of $η$ and $η^\prime$ in $J/ψ\to φη$ and $φη^\prime$ Search for Invisible Decays of $η$ and $η^\prime$ in $J/ψ\to φη$ and $φη^\prime$

2006-07-04

arxiv.org/abs/hep-ex/0607006v3

Phys.Rev.Lett.97:202002,2006

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures; Added references, Corrected typos

Scientific paper

10.1103/PhysRevLett.97.202002

Using a data sample of $58\times 10^6$ $J/\psi$ decays collected with the BES II detector at the BEPC, searches for invisible decays of $\eta$ and $\eta^\prime$ in $J/\psi$ to $\phi\eta$ and $\phi\eta^\prime$ are performed. The $\phi$ signals, which are reconstructed in $K^+K^-$ final states, are used to tag the $\eta$ and $\eta^\prime$ decays. No signals are found for the invisible decays of either $\eta$ or $\eta^\prime$, and upper limits at the 90% confidence level are determined to be $1.65 \times 10^{-3}$ for the ratio $\frac{B(\eta\to \text{invisible})}{B(\eta\to\gamma\gamma)}$ and $6.69\times 10^{-2}$ for $\frac{B(\eta^\prime\to \text{invisible})}{B(\eta^\prime\to\gamma\gamma)}$. These are the first searches for $\eta$ and $\eta^\prime$ decays into invisible final states.

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