Search for eta_c decays into pi pi and K Bar K

Abstract

Using 58 million $J/\psi$ events taken with the BESII detector, a search for $et{a}_c$ CP violating decays into $\pi \pi$ and $\bar{K}K$ has been performed. No clear $et{a}_c$ is observed, and upper limits for $B(et{a}_c->\pi \pi )$and $B(et{a}_c->\bar{K}K)$ are given at the 90% confidence level, $B(J/\psi ->\gamma {\eta }_c)\times B(et{a}_c->{\pi }^{+}{\pi }^{-})<1.1\times 10^{-5}$ , $B(J/\psi ->\gamma {\eta }_c)\times B(et{a}_c->{\pi }^0{\pi }^0)<0.71\times 10^{-5}$, $B(J/\psi ->\gamma {\eta }_c)\times B(et{a}_c->K^{+}{K}^{-})<0.96\times 10^{-5}$ and $B(J/\psi ->\gamma {\eta }_c)\times B(et{a}_c->{K_s}^0{K_s}^0)<0.53\times 10^{-5}$.

6 pages,4 figures

References in corpus (1)

• Measurement of the Branching Fraction of J/psi --> pi+ pi- pi0

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