Search for the process ${\mathbf{e}}^{+}{\mathbf{e}}^{-}\to \hat{\mathbf{I}}\cdot$

Abstract

A search for the rare decay $\hat{I}\cdot \to e^{+}{e}^{-}$ is performed using the inverse process $e^{+}{e}^{-}\to \hat{I}\cdot$ in the decay mode $\hat{I}\cdot \to \ddot{I}{€}^0\ddot{I}{€}^0\ddot{I}{€}^0$. We analyze data with an integrated luminosity of 654 nb${}^{-1}$ accumulated at the VEPP-2000 $e^{+}{e}^{-}$ collider with the SND detector at the center-of-mass energy $E=m_{\hat{I}}\cdot c^2\approx 548$ MeV, and set the upper limit $\mathcal{B}(\hat{I}\cdot \to e^{+}{e}^{-})<7\times 10^{-7}$ at the 90\% confidence level.

9 pages, 4 figures