Yayınlanmış 1 Ocak 2019
| Sürüm v1
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Açık
Search for rare decay $J/\psi \to \varphi {e}^{+}{e}^{-}$
Açıklama
Using a data sample of $448.1×{10}^{6}\text{}\text{}\psi \left(3686\right)$ events collected at $\sqrt{s}=3.686\text{}\text{}\mathrm{GeV}$ with the BESIII detector at the Beijing Electron-Positron Collider II, we search for the rare decay $J/\psi \to \varphi {e}^{+}{e}^{-}$ via $\psi \left(3686\right)\to {\pi }^{+}{\pi }^{-}J/\psi $. No signal events are observed and the upper limit on the branching fraction is set to be $B\left(J/\psi \to \varphi {e}^{+}{e}^{-}\right)<1.2×{10}^{-7}$ at the 90% confidence level, which is still about one order of magnitude higher than the Standard Model prediction.
Dosyalar
PhysRevD.99.052010.pdf
Dosyalar
(371.2 kB)
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