/ hep-ex arXiv:1612.02941

Improved measurements of branching fractions for $\eta_c\to\phi\phi$ and $\omega\phi$

Pages: 11

Abstract: Using $(223.7\pm1.4)\times10^6$ $J/\psi$ events accumulated with the BESIII detector, we study $\eta_c$ decays to $\phi\phi$ and $\omega\phi$ final states. The branching fraction of $\eta_c\to\phi\phi$ is measured to be $Br(\eta_c\to\phi\phi)=(2.1\pm0.1\pm0.3\pm0.5)\times10^{-3}$, where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of $Br(J/\psi\to\gamma\eta_c)$. No significant signal for the double OZI-suppressed decay of $\eta_c\to\omega\phi$ is observed, and the upper limit on the branching fraction is determined to be $Br(\eta_c\to\omega\phi)<2.5\times 10^{-4}$ at the 90\% confidence level.

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Запись создана 2017-01-09, последняя модификация 2017-01-09

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